Beyond Roving and Batts: Specialty Fiber Preparations at US Mills

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Beyond Roving and Batts: Specialty Fiber Preparations at US Mills

If you have been around fiber communities long enough, you have heard the same cycle: you start with roving, you try batts, maybe you graduate to combed top. Then someone posts a photo of something called pencil roving or a stack of art yarn locks and you realize there is an entire world of fiber preparations most hand spinners never encounter.

This post is a field guide to the specialty fiber preparations you can commission at US fiber mills, what they are actually like to spin, what they are best suited for, and which mills make them.

The standard preparations most mills offer are roving and batts. These cover maybe 70% of what hand spinners need. The specialty preparations below are the other 30%. They are less available, harder to find, and often require a conversation with the mill rather than a simple order form. But for the right project, they are exactly what you need.

Combed Top (Worsted Preparation)

Combed top is roving’s more refined cousin. Where roving is carded (fibers are organized but still have some randomness), combed top is carded and then combed through a series of fine combs that remove the short fibers and align everything parallel. The result is a dense, smooth, highly organized strand of fiber with very little waste.

Combed top is the starting material for worsted spinning. When you spin combed top, you are working with fibers that are already aligned, so you spin them with a long draw without letting them spread. The result is a smooth, dense, lustrous yarn with excellent stitch definition. Think of a commercial smooth merino fingering or a crisp linen-wear fabric and you are thinking of worsted-spun yarn from combed top.

What it is best for: Sock yarn, lace shawl yarn, projects where you want to see every stitch clearly, warp yarn for weaving, any project where durability and stitch definition matter more than halo or loft.

What it is not great for: Drapey, fluffy garments where you want the yarn to bloom and soften. The smoothness that gives worsted yarn its durability also gives it a tighter hand.

Finding it: Most custom mills that do worsted spinning can produce combed top. Not all do it regularly, so contact the mill directly. Minimums for combed top commissions are typically 5-10 pounds of clean fiber, similar to roving commissions.

Pencil Roving

Pencil roving is roving that has been drawn down to a thinner, denser consistency, roughly the diameter of a pencil or slightly less. It is carded fiber that has been pre-drafted slightly and wound under light twist into a long, narrow rope.

Pencil roving is popular with beginners because it is easy to spin consistently and produces a medium-weight yarn with minimal effort. But it is also a favorite of experienced spinners working on fine yarn because it is easier to spin down to laceweight from a pencil roving than from a fat batt.

The tradeoff is that pencil roving at most mills is not uniform along its length. Depending on the mill, it may have thick and thin sections that require the spinner to adjust drafting constantly. High-quality pencil roving from an experienced mill is much more consistent.

What it is best for: Fine spinning from a heavier prepared fiber, practice roving, weft yarn, art yarn where variable thickness is acceptable or desired.

What it is not great for: If you want a perfectly consistent fine yarn without constant drafting adjustments, pencil roving may frustrate you.

Finding it: Fewer mills produce pencil roving than standard roving. Ask mills that list roving services whether they can produce pencil roving as a custom commission. Some will; many will say they do not do it consistently enough to offer it.

Fiber Locks (Unprocessed and Combed Locks)

Fiber locks are exactly what they sound like: locks (the natural curls that fleeces form in) that have been cleaned but otherwise left intact. Some mills sell locks that have been combed into a clean, aligned bundle; others sell raw locks that still contain some VM and shorter fibers. Locks intended for spinning are typically cleaned and sometimes lightly carded at the tip.

Spinning from locks is a specific technique where you spin directly from the lock structure, letting the natural curl and crimp define the yarn. This is a common approach in art yarn spinning and produces highly textured, novelty yarns with visible lock structure. It is not a preparation for standard yarn production.

Locks are also sold to felters and crafters who use them directly in projects without spinning. The craft market for locks (especially colored and exotic breed locks) is separate from the spinning preparation market.

What it is best for: Art yarn, wet felting, needle felting projects, lock embellishment in fiber art, spinning novelty yarns with visible lock structure.

What it is not great for: Standard knitting or weaving yarn. The inconsistent length and texture of locks produces an uneven spun yarn that is not ideal for conventional textile projects.

Finding it: Mills that process unusual or specialty breeds (Icelandic, Shetland, Wensleydale, Manx Loaghtan) are more likely to offer locks as a product. Ask mills that handle heritage and rare breeds directly.

Rolags

Rolags are small, soft cylinders of carded fiber rolled by hand or machine from a carding drum. In the woolen spinning tradition, rolags are the preferred preparation because the rolling action further randomizes the fibers, enhancing the woolen character of the resulting yarn.

Rolags produce the quintessential woolen yarn: airy, soft, light, and warm with a characteristic halo from the protruding fiber ends. Spinning from rolags using a long draw is the fastest way to produce woolen yarn and results in a finished product with more loft and less density than the same fiber spun from roving.

Most US fiber mills do not produce rolags at scale because rolag-making is labor-intensive and most modern carding equipment is optimized for roving production. Hand-carded rolags from a drum carder are the most common source. However, some mills that work with traditional woolen equipment can produce hand-rolled rolags as a custom service.

What it is best for: Woolen spinning technique, light warm garments, traditional spinning practice, projects where loft and warmth are the priority over smoothness.

What it is not great for: Projects requiring smooth, dense, high-stitch-definition yarn. The randomized fiber orientation that gives woolen yarn its warmth also produces a fuzzier, less defined fabric.

Finding it: This is one of the harder preparations to find at a mill. If a mill advertises traditional woolen processing or has a standing woolen frame, ask whether they can produce rolags. Some will do small runs as a custom service; many will not because of the hand labor involved.

Core-Spun Yarn (Mill-Produced)

Core-spun yarn is yarn where a continuous core thread (usually cotton or wool) is wrapped with fiber that is then spun into a coherent yarn. The core provides structure and strength; the outer fiber provides the surface character and color.

At a mill scale, core-spun yarn is produced on specialized equipment that feeds a core yarn through a spinning frame while carded fiber is wound around it. This is different from simply plying a singles yarn with a commercial thread: the fiber is wrapped helically around the core with each pass of the spinning mechanism.

Core-spun yarn is valued for its durability (the core thread prevents breakage during knitting) and its efficient use of premium fiber (you use less of the expensive fiber because the core provides the structural bulk). A Merino/silk core-spun yarn, for example, can be knit at a lighter gauge than a 100% merino yarn of equivalent warmth because the core provides strength without weight.

What it is best for: Using expensive fiber more efficiently, creating durable yet lightweight yarns, sock yarn (especially with a nylon core), weaving warp and weft.

What it is not great for: Projects where you want 100% of a specific fiber with no core material. If you are allergic to wool or cotton, a wool-core or cotton-core yarn is not suitable.

Finding it: Not all mills have core-spun equipment. This is a specialized capability that requires specific machinery. Ask mills explicitly whether they produce core-spun yarn and what core materials they work with. Minimums for core-spun commissions are typically higher than for standard roving commissions.

Multicolored or Blended-Top Preparations

Some mills offer what is called “breadcrumb” or “confetti” blending, where different colored fibers are blended into a prepared top in a way that maintains visible color variation in the final yarn. This is different from solid blending where colors merge into a single new color.

The effect in the spun yarn is flecks and bursts of different colors, similar to what you see in some commercial speckled or tweed yarns. The color variation comes from having different colored fibers present in the prepared top, not from dye applied after spinning.

This preparation is sometimes called a “breeder’s blend” because some fiber farmers use it to create interesting colorways from their naturally colored flock’s various shades without dyeing.

What it is best for: Natural-colored yarns with visual interest, avoiding dye processes, creating colorways that cannot be replicated with overdyeing.

What it is not great for: Projects requiring uniform solid color. The whole point is color variation.

Finding it: Most mills do not advertise this as a standard product. It requires the mill to have multiple colored lots of the same fiber type available to blend. Mills that keep their own fiber inventory and do custom blending are the most likely candidates. Contact mills that list custom blending as a service and ask specifically whether they can produce a multicolored blend from specific colored lots.

How to Commission Specialty Preparations

Specialty preparations are almost never available through an online order form. Here is how to approach a mill about them:

  1. **Identify mills that explicitly list the capability** or have a history of working with unusual preparations. Use the directory to filter by service type and look for mills that mention custom work.
  1. **Contact the mill directly** by phone or email. Describe what you want in specific terms: fiber type, preparation type, weight, volume, and intended use.
  1. **Ask about minimums.** Specialty preparations often have higher minimums than standard roving because the mill has to set up equipment for a non-standard run.
  1. **Ask about pricing separately.** Specialty preparations often cost more than standard roving. Get a per-pound figure and confirm whether it is based on raw input or finished output.
  1. **Request a sample if possible.** Before committing to a full run, ask whether the mill can send a small sample of a similar preparation they have produced. This tells you more about their quality than any description.
  1. **Confirm lead time.** Specialty preparations often require the mill to adjust equipment and scheduling. Confirm whether the quoted turnaround is realistic for a non-standard run.

Frequently Asked Questions

Is combed top harder to spin than roving?

No, it is different. Combed top is easier to spin finely because the fibers are already aligned, making drafting more predictable. The real adjustment is learning the worsted long draw technique instead of the woolen short draw. If you can spin roving, you can learn combed top.

Can I get a blend of two preparations, like roving with silk added as locks?

Some mills can do this, but it is complex to produce consistently. Start with what the mill produces reliably and ask whether they can modify it for your specific request. Highly specific preparation requests are more likely to be declined or priced higher.

How do I store specialty preparations like combed top or pencil roving?

Store in breathable bags in a dry, dark location. Do not store in plastic long-term; condensation causes felting. Combed top is less prone to cotting than roving, but all prepared fiber should be spun within 6-12 months for best results.

What is the difference between roving and top?

In the US market, “roving” means carded fiber (random orientation). “Top” in worsted spinning means combed fiber with fibers fully parallel. Some US mills use the terms interchangeably, so describe the preparation physically (dense and smooth vs. fluffy and airy) rather than relying on terminology alone.

Conclusion

Roving and batts are the entry point to mill-processed fiber, not the destination. The specialty preparations described here represent the next level of customization available at US fiber mills, each suited to different spinning techniques, yarn characteristics, and project goals.

Not every mill offers every preparation. Finding the right combination requires matching the mill’s specific equipment and expertise with your project requirements. The mills that produce specialty preparations tend to be the ones that enjoy working on custom problems, so a direct conversation is usually more productive than an online inquiry.

Use the directory to find mills offering the specific preparation you need, and do not hesitate to contact mills even if they do not explicitly list your preparation. Many mills accept custom commissions outside their standard offerings.

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