NIKE Element Thermal Half-Zip Long Sleeve Running Top Dri-Fit - Made from excellent wicking material which keeps you dry, comfortable and warm. Mesh Panels - Underneath the arms for great ventilation and breathability keeping you drier and more comfortable. Ergonomic Seaming - Anatomically shaped to reduce friction and allow for a greater freedom of movement. Mock Neck - Help protects against the elements. Underarm Gussets - Enhance mobility and range of motion during upper-body workouts.