Sun Mountain Outerwear allows golfers to play earlier, play later and extend the season with golf-specific thermal wear. In addition to golf rain jackets, Sun Mountain also offers a stretchable, thermal layer called ThermalFlex. The ThermalFlex golf pullover is a half-zip jacket that can be worn alone as the perfect jacket for chilly mornings or as a warm, mid-layer on rainy, windy, cold days. ThermalFlex is available now. For the retailer nearest you, call 800-227-9224 or visit to find a retailer near you. View ThermalFlex Golf Outerwear ThermalFlex is the latest installment of thermalwear from the company that was the first to bring fleece to golf in the early 90s. Other pieces in Sun Mountain's thermal line include: Second Layer waffle-weave thermal pullover, WeatherShield and WeatherFlex jackets, Gallatin fleece, and a full-line of women's thermalwear to complement the women's waterproof golf jacket. In regions of the World where the weather is ever-changing, Sun Mountain has a golf-specific outerwear solution to enable a comfortable round of golf.