Lycra fabric. It’s structure’s compactness, density and multidirectional elasticity make it superiorly long-lasting. Santini Shorts and Bibs Sizes: XS = 26” Waist S = 28” Waist M = 30” Waist L = 32” Waist XL = 34” Waist XXL = 36” Waist XXXL = 38” Waist