Constructed from a soft and supple 135gsm French-milled stretch fabric, our lightweight baselayer program is designed for maximum comfort and performance in all athletic pursuits, offering odor and moisture management with durable over-lock construction for a dependable and barely-there feel. Due to the extremely breathable nature of this fabric, we don’t recommend wearing a backpack or accessory that will rub against the shirt, as this can cause excessive pilling.