Madeira Aeroflock serger thread is a soft and fluffy looper thread that's ideal for elastic seams on underwear, lingerie, sportswear, swimwear and gym wear. For trouble-free stretch stitch seams with excellent recovery, this textured polyester thread is designed specifically for sewing smooth, durable stretch seams in knitwear. Madeira Aeroflock 100 weight thread is shrink-resistance with guaranteed durability, including with frequent washing and exposure to stress.