LIGHTWEIGHT WARMTH. The Nike Wild Run Top provides just the right amount of added warmth for chilly days. Cozy fabric wraps your core, while lightweight stretch fabric at the sleeves lets you pump your arms freely. Stay Warm Nike Therma fabric helps manage your body’s natural heat to keep you warm — and performance high when temperatures are low. Block Out the Cold 1/2-zip closure lets you adjust your coverage and ventilation. Elastic at the cuffs helps keep out cold air. Move Naturally Crisp woven fabric with 4-way stretch on the sleeves is lightweight and lets you move freely. More Benefits Curved back hem for coverage.