Mountain Hardwear® Trekkin Thermal Henley Shirt. Waffle knit warmth to save your bacon! The snow is flying, a cold front is blowing in, and work is calling on the phone. Throw on this Trekkin Thermal Henley Long-sleever and lock in your core heat against the coming icy assault. Layer up under your snow suit or parka. Or wear on its own during your off-hours at the house or shop. From the outdoor experts at Mountain Hardwear, you'll be ready for the long haul through every winter job.