One of Sun Mountain's most popular pieces due to its versatility, the ThermalFlex is a soft, quiet, polyester shell with 4-way stretch that provides outstanding comfort and freedom of movement. For 2018, they have upgraded the fabric to have even more stretch and a softer hand, which just makes a great product better.
Soft polyester shell with added spandex
Comfortable and quiet, with significant 4-way stretch
Deep-cut zipper for easy on and off
Locking zipper pull