Salomon Women's Sonic Pro 100% Mesh Synthetic sole 3D Stretch Air Mesh - Provides key breathability. Sensifit - Precise, secure fit for maximum comfort and stability. EndoFit - Internal fit sleeve to improve feedback and foot-wrapping. Quicklace System - Simple but strong 'one-pull' tightening system. Lace Pocket - Quick, easy and secure lace pocket.