Sprayway 1/2 Zip Roola RRP: £55 (widely available for less)Weight: 195g (men’s large) The lightweight Roola is 50% merino wool and 50% polyester, combined to give a very comfortable base layer with a moderate amount of stretch. It’s extremely soft to touch, quick to dry, wicks well and gives a reasonable amount of warmth – though it’s not as toasty as some of the other bases featured below and will require more layers in the coldest conditions. I do like having a half-zip on winter base layers to give a venting option when needed. It comes in two colours and sizes from S to…