Sugoi SubZero Thermal Cycling Tight Without Chamois for Women S2 Insulation: Offers versatile mid weight thermal protection for either single layer use in a wide variety of transitional conditions or layering in colder and more severe weather. The fabrics used in S2 garments are most often lightly fleeced on the inside to trap air and create light insulating layer. Full mobility and stretch along with convertible ventilation and high performance are paramount for comfort during aerobic activities. Breathable: Reduces overheating by allowing perspiration to escape, Dries quickly, Durable and lightweight Water Resistant:Water and wind resistant,Reduces overheating by allowing perspiration to escape, Extremely light and compact Flat seams for increased comfort Insid key/card pocket at waist