Nike Pro Women's Hyperwarm 8-Bit Training Pants The Nike Pro Hyperwarm Flash Girls' Training Tights are made with thermal, sweat-wicking stretch fabric and ergonomic seams to lock in heat and provide a comfortable fit that moves with you. Inseam gusset enhances range of motion Reflective elements offer visibility in low-light conditions Brushed interior enhances warmth and comfort Elastic waist for a snug, comfortable fit