The Callaway Ultrasonic Quilted Technical Pullover with Thermore Thermal Booster is a ¼ zip pullover with 2 tone zippers and elasticated sleeves. Thermore’s Thermal Booster has been developed so that the golfer is able to maintain a constant temperature in normal playing conditions. As the temperature drops, this product offers a thermal boost in order that the golfer can maintain a comfortable temperature. This is a unique feature of this technology, allowing the golfer to concentrate on their game instead of the temperature. The product also benefits from Dual Action Technology which absorbs moisture inside and repels moisture outside.