comfort from start to finish. the nike element half-zip long-sleeve girls' running top is made with dri-fit fabric and a mock neck to help keep sweat and the elements at bay during a run.. benefits. dri-fit fabric helps keep you dry and comfortable. mock neck zips up to the chin for warmth and protection from the elements. ergonomic seams and stretch fabric provide wide range of motion. flat seams move comfortably against your skin as you work out. thumbholes at the cuffs for coverage that stays in place. reflective elements for enhanced visibility in low light. product details. reflective loop at upper back to help keep media-player cords out of the way. fabric: dri-fit 89% polyester/11% elastane. machine wash.