The Women"s HOTTOTTIES Ecolator TR 3.0 Fleece Long Sleeve Scoop is Terramar"s warmest temperature-control layer. It features Terramar TR Thermoregulation technology with Climasense, to provide comfort with optimal moisture and temperature management. Looks good enough to wear on its own and also excels as a comfortable, breathable, lightweight layering garment. Essential layering for colder weather.Dual surface knitting system incorporates high-loft grid channels for enhanced breathability and effective moisture transport..UPF rating 50+..Low-profile thumbholes..Flatlock seams for comfort and stability; soft and non-chafing next to skin..Saddle shoulder reduces chafing while wearing a pack..Warmth Factor 3.0..Import..