Don\'t let the cold scare you. Our Thriller thermal underwear set is made to provide extra warmth in any weather and will be especially cosy when worn as that all-important layer in the winter or under ski gear. Please Note: If purchasing for a woman, we suggest selecting one size below your usual choice. Returns Policy Please note that our returns policy for products such as base layers and swimwear differs from other products. These items are classed as ‘undergarments\' and for hygiene reasons are non-returnable and will not be accepted back unless faulty. EXPERT ADVICE Need some guidance on what Base Layers are right for you? Check out our article on Base Layers Explained. View all Expert Advice Guides