Dreamsacks Bamboo Mens Undershirt is a lighter weight fitted shirt perfect for wearing under dress shirts, polos, or other tops. The Men's Undershirt is perfect for all year round with this fabulously soft knit bamboo. The Short Sleeve Shirt is pesticide free and made from a renewable source. The bamboo material is hypoallergenic which provides better breathability and comfort. Bamboo is sustainable, environmentally friendly, and easy to care for. The perfect everyday shirt.