Alpinestars HT Heat Tech Vest From  £313.49

Very comfortable and functional. Thin and provides surprising amount of warmth, even without the power on. With battery power option (in addition to connection to moto battery) you can wear as a layer when off the moto--winter sports, cycling, or just walking around town. I typically wear a L, but purchased an XL based on other reviews stating it fit tight. The XL is just a little loose. An L probably would have been fine. Visorshop shipping and delivery to US was prompt and efficient as per.