Wunder Train Collection: Fast drying everlux fabric, breathable, sweat wicking, four way stretch, supportive, feels cool and sleek on the inside, soft and brushed on the outside, added Lycra fibre for stretch and shape retention. *Sizing Tip: measure a pair of leggings that fit best, in the same way these photos are shown and compare measurements. Lululemon sizing can be different for some, I know it is for me!