【Extra Thick & Eco-Friendly Foam】: Adopt a 0.75'' high-dense EVA material, Yiitoll blocking mats for knitting is durable and lightweight. The pins can push deep into the foam keeping your crochet, knitting, lace or needlepoint work taut, and you can reuse the crochet blocking board for many years. 【Heat & Steam Resistant】: The closed-cell EVA foam is waterproof and heat-resistant, which creates an ideal surface for steam blocking. You can safely steam your blocked pieces. The blocking mats for crochet are also perfect for drying your knits, cold blocking, or wet blocking. 【Fit Any Size Project】: Use the individual board (12”x12”) for smaller