Men's Mechanism Pro Sleeveless Base Layer

PNS base layers — worn under a jersey year-round. The Short Sleeve Base Layer and Mid Base Layer are summer weights. The Long Sleeve Base Layer is the spring-fall weight; the Long Sleeve Thermal is the cold-weather grade with a brushed interior. The Thermal Hooded Windproof Base Layer adds a wind-blocking front panel and an integrated hood for the coldest base-layer position in the PNS range.