K-SWISS Women's Ultra Express 100% Synthetic Synthetic sole Lightweight mesh uppers with synthetic overlays for durability; A padded tongue and collar provide comfort and support. Stay-tied lace system act as a "catch" to keep the laces tied; DragGuard is featured in high wear areas of the toe and heel, offering increased abrasion resistance. Y-Beam mid-foot support structure anchoring the arch area with a TPU injection component; Breathable mesh lining and Heel Grip Lining made of interlocking fibers grips the sock to minimize heel slippage.