What Is Wool Roving? How It Is Made and What It Is Used For

How wool becomes roving

Raw fleece is first scoured, washed in hot water and detergent to remove lanolin, dirt and sweat. The clean wool is then carded: run through rollers covered in fine wire teeth that open up the locks and lay the fibers roughly in one direction, while leaving them airy and slightly jumbled. The carded web comes off the machine and is either rolled up as a batt or pulled into a continuous strand.

In strict mill terms, that carded strand is sliver, and roving is sliver drawn out further and sometimes given a very light twist so it holds together. Hand spinners and felters rarely make that distinction, and you will see sliver, roving and carded wool used for the same product.

Roving vs combed top

Combed top goes one step further. After carding, the wool is combed, which removes short fibers and lines the remaining long fibers up almost perfectly parallel. Top feels smooth and silky and has a slight sheen. Most dyed merino sold online for felting and spinning, including many bags labeled roving, is actually top.

The difference shows in use. Carded roving has fibers pointing in many directions and traps air, so it felts quickly with a needle and spins into a lofty, warm woolen style yarn. Top, with its aligned fibers, spins into a smooth, dense worsted style yarn and lays out neatly in thin, even layers for wet felting. For needle felted sculptures, top is slower to firm up because the fibers slide past each other, so felters often use carded wool or batting for the core and top only for the surface colors.

A quick test if a listing is vague: pull a tuft from the end. Top separates into long, straight, parallel fibers. Carded roving comes away as a fluffy, crisscrossed cloud.

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Roving vs batting and core wool

Batting is carded wool left as a flat, wide sheet instead of a rope. It is the easiest form to wrap around a core or to tear into flat pieces, and it felts fast because the fibers are already crisscrossed. Core wool is usually a coarse, inexpensive carded wool, often sold as batting or in loose bags, meant for building the inside of a needle felted shape before covering it in finer colored wool.

In practice, for needle felting you want carded wool or core wool for bulk and roving or top in colors for the outside. For wet felting, merino top laid in thin, crossed layers is the standard. For spinning, top gives a smooth yarn and carded roving gives a soft, airy one.

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Breeds and micron: what the label tells you

Wool fineness is measured in microns, the average fiber diameter. Merino is usually 17 to 24 microns and feels soft against skin, which is why it is the default for wet felted scarves and for spinning next-to-skin yarn. Corriedale sits around 25 to 30 microns and is a medium wool with good crimp, popular for needle felting and for learning to spin. Blue Faced Leicester, around 24 to 28 microns, has long lustrous fibers. Coarser wools of 30 microns and above, often sold as core wool, felt firmly and quickly with a needle but feel scratchy against skin.

Staple length, the length of individual fibers, also appears on good listings. Longer staple fibers of 3 to 5 inches are easier to spin and hold together better in wet felting. Very short fibers shed and pill more.

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What wool roving is used for

Roving and top are the raw material for needle felting, wet felting, nuno felting on silk, hand spinning on a spindle or wheel, and chunky arm-knit blankets made from unspun top. Smaller uses include felted soap, dryer balls, doll hair and texture in weaving.

For arm knitting, note that unspun top pills and pulls apart with heavy use because it has no twist holding it together. It looks good as a decorative throw but will not wear like knitted yarn.

When buying, check three things on the listing: whether it says carded or combed, the micron or breed, and the weight per color. Small color packs of 3 to 10 g per shade are fine for needle felted details but run out fast in wet felting, where even a small flat piece needs at least two full crossed layers of fiber. Store roving loosely in breathable bags away from moths, and avoid packing it tightly for months, which compacts top and makes it harder to draft.

Frequently asked questions

Is wool roving the same as yarn? No. Yarn has been spun and has twist that holds the fibers together. Roving has little or no twist and pulls apart easily.

Can you knit with wool roving? You can knit very loosely with thick top for arm-knit blankets, but it is fragile and sheds. For normal knitting, spin it into yarn first.

Is acrylic roving the same as wool roving? No. Acrylic fiber does not felt with water and only felts poorly with a needle, so it is not a substitute for wool in felting.

How much roving do I need for needle felting? A palm-sized animal usually needs 10 to 30 g in total, mostly core wool, with a few grams of each surface color.