#1 - Warm & Natural is the highest grade cotton needled to a strong yet soft base material securing the natural cotton in place without any glue. Prewashing is not necessary - ready to quilt. Fast to finish by hand machine or simply tie leaving up to 10 open. Your needle will easily glide through your quilted layers. Once quilted machine wash and dry without worry of bunching shifting or migrating. The 3% shrinkage achieves an antique ready to cuddle finish. Make magnificent quilts decorative wall hangings cuddly soft sculputure and classic wearable art with Warm & Natural. Quilters from around the world praise the ease and adaptability of Warm & Natural needled cotton batting.