The Spirit Sleeve made of a high quality cotton/poly blend great to create the trendy, layered look compact size makes it perfect for on-the-go, instant warmth won't shrink, fray, or lose its elastic properties made of a high quality cotton/poly blend Sizing: Size A: approx. 17 inches, fits 4th grade & up, Size B: approx. 13 inches, fits pre-k to 4th grade