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DeFeet designed the UnDLite tank to work in conjunction with your cycling jersey. The DeFeet UnDLite™ material is derived from material that was found inside athletic shoes and DeFeet worked hard to adapt the material to a stretch and thin four season base layer. Moisture wicks away and you barely notice that you are wearing an extra layer. Part of the reason is that the light and airy fabric moves with your body. The Defeet UnDLite™ is suitable for all aerobic activities beyond just cycling.
Sizing Guide - Measure around fullest part of the chest, under the arms and including shoulder blades