Rarely used. UNIQLO L Men's HEATTECH Ultra Warm Turtleneck Black Turtleneck Sweater About this item Item number: 420942 Specifications ・Comfortable features such as heat generation, heat retention, moisture retention, and moisture absorption/release are added. ・Stretchy material with excellent shape retention. ・Approximately 2.25 times warmer than regular HEATTECH. ・Turtleneck with a focus on fit to provide thorough cold protection around the neck.