It's a trim-fitting insulating jacket that can be worn as a layer under a hard shell to provide warmth, or by itself as a wind and water-resistant jacket.

这是一件剪裁修身的夹克，可以穿在硬壳里面作为保温层，当然，本身也可以作为一件防风防水的夹克。

youdao

So he did have something to do: he collected these pieces of paper, and put on a tan water-resistant zippered jacket and a Red Sox cap.

NEWYORKER: Outage

The Boogie Board Jot Jacket is a fitted water-resistant neoprene sleeve that provides the highest level of protection and is ideal for taking the Boogie Board Jot eWriter wherever you go.

ENGADGET: Boogie Board Jot eWriting pad hands-on (video)