Mens Thermal Microfleece Top Heat Holders Microfleece thermal construction holds more warm air close to your body, keeping you warmer for longer. Great for wearing under anything as a soft thermal base layer. To be the warmest you can be, in the coldest of times, you need a high-performance layer next to your skin to start you off. Heat Holders Thermal Microfleece Base Layer is the answer to this Made of a light-weight microfleece, it has an excellent weight to warmth ratio which in turn means a highly versatile layer. It also has flat comfort seams which minimise bulk to help in creating a durable and non-chaffing fit - making it perfect for layering The Top of the Base Layer has a 14 Zip Collar, along with a protective chin guard enables practical venting, ensuring you can obtain a suitable temperature and comfort around the neck. It comes in a range of sizes from Small to XX-Large (34-52 Chest), to help you with the best fitting thermal base layer. All items from the Microfleece Base Layer have a great 0.61 TOG Rating. This base layer comes in both men s and ladies sizes, and both tops and bottoms are available Extra Product Details Microfleece Top 5 Sizes 14 Zip Collar 0.61 TOG Lightweight microfleece Comfort seams Breathable construction Multi-directional stretch Bottoms also available Ladies also available