Best Blocking Mats for Knitting
By FiberCroft . 8 min read . Updated November 2026
A blocking mat is the surface that holds a finished knit in its final shape while it dries, so the wrong mat quietly undoes the work of blocking. A good mat takes T-pins firmly, has a grid that keeps edges square, and connects into enough area for the pieces you make. This guide covers what to look for and how much surface a sweater or shawl needs, starting with the KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins) as the all-in-one pick and the KnitIQ Blocking Mats Extension Kit (3 Extra Boards) for larger projects.
Quick answer
The KnitIQ Extra Thick Blocking Mats are the best blocking mat set for most knitters. Nine interlocking foam boards with a grid and 150 T-pins come in one kit. Add Knit Picks Lace Blocking Wires for lace and a Eucalan no-rinse wool wash for the soak.
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What does a blocking mat need to do?
A blocking mat has three jobs: accept pins without them tipping, stay flat under damp fiber, and give you a grid to measure against. The KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins) does all three with extra-thick foam and a grid, which is why it is the top pick here.
Check thickness before you buy any mat. Aim for at least half an inch of foam so pins hold without poking through to the surface below, because thin mats let pins loosen once the piece is damp.
KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins)
Nine interlocking extra-thick foam boards with grids, plus 150 T-pins and a storage bag. The most complete blocking mat kit available at an accessible price.
How much blocking surface do you need?
The KnitIQ base set connects nine boards into a surface large enough for a full adult sweater back. For a single shawl or one sweater piece, that is usually enough room to pin the whole piece flat with its edges visible, so the base set covers most knitters.
Larger projects need more area. The KnitIQ Blocking Mats Extension Kit (3 Extra Boards) adds three boards that match the base set in thickness and grid, so you can block a large lace shawl or two pieces at once. It only works alongside the KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins), so buy the base set first.
KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins)
Nine interlocking extra-thick foam boards with grids, plus 150 T-pins and a storage bag. The most complete blocking mat kit available at an accessible price.
KnitIQ Blocking Mats Extension Kit (3 Extra Boards)
Three additional interlocking foam boards that expand an existing KnitIQ set for blocking very large shawls or multiple project pieces simultaneously.
Do blocking wires replace pins?
Blocking wires do not replace pins, but they cut the number you need, which makes the Knit Picks Lace Blocking Wires the upgrade that matters for lace. The wire holds a shawl edge straight, so you thread the Knit Picks Lace Blocking Wires through the edge and anchor it with a few pins instead of placing one at every point.
For a square or rectangle, pins alone are usually enough. Threading through lace points takes some practice without snagging, so test the wires on a swatch first. The set is 15 straight stainless steel wires at 34.5 inches (880 mm) each.
Knit Picks Lace Blocking Wires
A set of 15 straight stainless steel blocking wires, each 34.5 inches (880 mm) long.
Which soak and pins go with the mats?
Eucalan No-Rinse Wool Wash is the soak to pair with these mats, because it cleans and conditions natural fiber without a rinse step. Add 1 teaspoon (5 mL) per gallon of water, submerge the piece until it is saturated, then squeeze out the water without wringing before pinning it on the KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins).
The KnitIQ set includes 150 T-pins, so most knitters do not need a separate pin purchase. If you add your own pins for a bigger piece, choose rustproof ones, since plain steel can rust and mark light yarn. Check the yarn label before any steam.
Eucalan No-Rinse Wool Wash (Lavender)
A no-rinse, plant-derived wool wash concentrate that cleans, conditions, and softens natural fiber. A small amount per blocking soak keeps handknits fresh and supple.
KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins)
Nine interlocking extra-thick foam boards with grids, plus 150 T-pins and a storage bag. The most complete blocking mat kit available at an accessible price.
Can a yoga mat replace a blocking mat?
A yoga mat is a poor substitute for a blocking mat, because most are too thin to hold T-pins securely and their textured surface gives you nothing to pin square against. Purpose-made foam takes the pins firmly and the grid keeps edges square.
A yoga mat can work in a pinch for a small square. For anything with a shaped edge or a lace pattern you want to see clearly, the KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins) saves time on every piece.
KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins)
Nine interlocking extra-thick foam boards with grids, plus 150 T-pins and a storage bag. The most complete blocking mat kit available at an accessible price.
How long does a blocked piece take to dry?
Most wet-blocked pieces take 24 to 48 hours to dry at room temperature, and the mats just hold the piece flat for that whole window. Heavy woolen pieces or a humid room can take longer, so plan for the longer end.
Leave the pins in until the piece is fully dry, not just surface dry, because damp fiber inside the piece can relax back toward its unblocked shape. Use a fan to speed drying, and keep pinned pieces away from heaters and dryers.
KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins)
Nine interlocking extra-thick foam boards with grids, plus 150 T-pins and a storage bag. The most complete blocking mat kit available at an accessible price.
Featured in this guide
KnitIQ Extra Thick Blocking Mats (9-Pack with 150 T-Pins)
Nine interlocking extra-thick foam boards with grids, plus 150 T-pins and a storage bag. The most complete blocking mat kit available at an accessible price.
KnitIQ Blocking Mats Extension Kit (3 Extra Boards)
Three additional interlocking foam boards that expand an existing KnitIQ set for blocking very large shawls or multiple project pieces simultaneously.
Knit Picks Lace Blocking Wires
A set of 15 straight stainless steel blocking wires, each 34.5 inches (880 mm) long.
Eucalan No-Rinse Wool Wash (Lavender)
A no-rinse, plant-derived wool wash concentrate that cleans, conditions, and softens natural fiber. A small amount per blocking soak keeps handknits fresh and supple.
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FAQ
Frequently asked questions
Do I need blocking mats if I only block lace?+
Lace is the case where a mat matters most, because the open pattern only shows when the piece is pinned at full size with straight edges. A grid mat lets you check those measurements as you pin. Wires are the next step for straight shawl edges, but the mat is what holds the shape while it dries.
How many T-pins do I need?+
Pin straight edges closely enough that the fabric lies flat between pins, and add more pins around lace points and curves. The KnitIQ set includes 150 T-pins, which leaves room for a full sweater or shawl in one session.
Can I steam block on these mats?+
The KnitIQ set is sold for steam blocking, so it is meant for that use on wool and natural fibers. Hover the iron or steamer above the fiber rather than pressing it, and never steam acrylic, since heat can permanently change its texture. Check the yarn label before steaming any blend.