New Balance Women's Apparel Size Chart With PrimaLoft(R) insulation at the front and breathable Heatgrid fabric at the back, the NB Heatgrid Vest delivers lightweight warmth everywhere you need it. This women's running vest has a high collar to help protect your neck from cold winds. NB HEAT technology adds even more warmth and wicks away moisture to help you stay comfortable and dry as you power through each mile. Features: - Athletic fit built to skim your chest, waist and hip - perfect for active movement with a fit that's not too tight - Elasticized back hem helps to seal in warmth - Half-zip front - Heatgrid fabric on back panel for breathability and warmth - High collar for extra coverage - Kangaroo pockets keep your hands warm and store essentials - NB HEAT technology helps keep you warm while wicking away moisture - Poly-knit with PrimaLoft(R) fill in front body and in collar for added warmth - Sleeveless - 100% Polyester body; 69.5% Polyester/26% recycled polyester/4.5% spandex lining