The 2XU Compression Calf Guards are constructed with a circular knit. This knit technology is the most suitable knit structure for Compression wear with a 360 degree stretch/stretch compression. Exclusive to 2XU, the 50 Denier Lycra, compared with 30/40 Denier used by our competitors truly sets 2XU apart from the rest of the field. Denier represents the thickness of the yarn, a thicker yarn delivers a stronger compressive power. The graduated compression fit ensures that your blood flow is optimized and does not lose its compression properties. What’s the big deal with compression wear you ask? These new technologies help remove waste by-products, dampen muscle vibration ensuring longer performance with less fatigue.