2XU Apparel Size Chart The MCS Alpine Compression Top has been developed with a key understanding of the muscles used to power up on the slopes. Skiing requires a series of complex interactions between the upper and lower body muscles including balance, posture and rotational movements. 2XU's MCS support system targets the key muscles used in downhill skiing for balance, stabilisation and endurance. Features: - Lightweight yet powerful PWX fabrics - Durable yarns that outlasts the competition - Multi-directional stretch - Flexible & breathable - Moisture wicking yarns to help keep you dry - UPF50+ sun protection - Antibacterial