Our Tri Top is constructed of two special light weight fabrics from MITI. We decided to use a light but at the same time with 50 UV protection for the back and arms. So not only is it aero but it also protects you on those hot summer days. The second fabric is equally as light but more open to allow airflow, we only use it on the front and side inner panels. Final touches are 10" closed end zipper for easy opening with MAB silicon gripper to keep the jersey in place. Our goal is to provide the best quality products but to also create a simple but functional product.