This is Hard Tail's supplex version of the longstanding and popular Roll Down Boot Leg. Hard Tail's new Supplex fabrics are highly technical. The list is long, but the highlights are that this fabric is more durable, wicks away moisture to keep you dry, and still has that four way stretch Hardtail is famous for. The fabric is antiMicrobial; perfect for hot intense workouts. 90% Supplex, 10% Lycra.