Flat-Lock Stitching - Eliminates thick seams, for greater comfort overall. * Elastic Neck Tape - Provides durability stitching reinforcements on the drawcord, hood opening and pocket are added for long-lasting wear.. * Low-Profile Drawcord - On the hood lets you adjust the fit. * Underarm Gussets - Enhance mobility and range of motion during upper-body workouts. * Mesh Lined Hood - Designed for ventilation, providing good air flow.