Bontrager cycling Thermal Windblock Jacket Like new DESCRIPTION Even the coldest temps don't stand a chance when you're wearing Bontrager's toasty warm Thermal Windblock Jacket. With a fleecy inside for outstanding thermal efficiency and a wind-stopping membrane to keep the breeze out, the Thermal Windblock Jacket uses stretch-knit paneling and an ergonomic, cycling-appropriate cut to deliver enhanced on-bike mobility and performance.