- Size: 3XL • Made with 15% spandex and 85% polyester, this undershirt is soft, comfortable, durable, and lightweight. • Offers maximum breathability to keep you cool and dry during your bike rides. • Ergonomic design with three-dimensional cut and elastic fabric for a comfortable fit while cycling. • Fabric with square holes that promotes heat dissipation and quick drying. • Ideal for road cycling and MTB, as well as running, gym, and daily exercise. • Before purchasing, take your measurements and consult our size guide.