and when zipped it has a double layer of leather on the front panels to increase wind resistance

It's just like its name says

two chest pockets and two hand warmer pockets

and really pops under close inspection

and is light enough to wear in the warmer months

Knickerbocker Rib Pocket T-shirt - Black personalcare and when zipped it hasThe Rib Pocket T Shirt is built from a custom jersey made with long staple, dual ring spun, combed cotton, giving it a soft feel with solid durability behind it. The drop needle construction adds a subtle ribbed texture that sets it apart in a tastefully subtle way. Its finished with a mounted collar, a nod to classic sportswear.