The Patagonia Men's R4 is an impressively warm and windproof fleece jacket. You might be thinking "the R4 is the highest number R jacket in the series... it must be the warmest".... well, that's awfully presumptuous of you, but you're right. This time. The R4 is comprised of 3 layers: the outer is super warm high-loft R4 fabric, the middle is Polartec Windbloc polyester with a windproof laminate, and the inner layer is an R2 grid. You might be thinking "sounds like you're wearing a sandwich".... well, this time you're not so right. Wearing a sandwich would be strange and not feasible and wouldn't give you this level of warmth, comfort and mobility with minimal bulk. So quit trying to wear a sandwich, silly, and check out the Patagonia R4 mid-layer.
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