(TrendHunter.com) UNIQLO’s HEATTECH collection tackles the age-old problem of winter bulk by engineering fabrics that generate heat from your own movement. The technology uses a blend of polyester, acrylic, and…(TrendHunter.com) UNIQLO’s HEATTECH collection tackles the age-old problem of winter bulk by engineering fabrics that generate heat from your own movement. The technology uses a blend of polyester, acrylic, and…