*Not sure about sizing? This item is eligible for a FREE return.
Due to its versatility, the ThermalFlex continues to be one of our best-selling pieces. ThermalFlex is a soft, mid-weight layer that provides outstanding comfort and freedom of movement due to its 4-way stretch and quiet nature. For 2019, we have upgraded the zipper to a YKK Vislon zipper, which just makes a great product better.