Dayton is a three-in-one jacket solution. The external piece is a lightweight, windproof and waterproof shell with 20K membrane - as good as it gets in terms of weather protection and moisture management. The internal piece is a Primaloft PicPuff midlayer, which provides optimum warmth and breathability.
Purchased together they represent a substantial saving compared to buying both pieces of the system seperately, and you're guaranteed to get the right sizes.
This lacie little thigh-biter is made out of fine-weave underwear-type material, but has a tone on tone inner to stop you being arrested for indecency. There are two fake pockets and a woven patch at the back, and a hidden zipper and catch up front.