Best for intense activity
Houdini Pace Flow Houdi
£170 at houdinisportswear.com Running, climbing, paddling, this is the midlayer you need. Why? Well, the 100% recycled and recyclable Polartec Power Dry Mesh is a large mesh grid, apparently modelled on mesh underwear worn by Swedish fishermen. On a run or climb, the air will flow through the midlayer, cooling you down and venting any sweat. But under a waterproof, those holes in the mesh trap lots of air, making it insulate very effectively.Best for mountain activities
Haglofs Roc Nordic Mid Hood
£180 at haglofs.com This technical midlayer is designed for mountaineering, and adventures high in the mountains. It’s a jacket in itself, with two chest pockets and two side pockets. The material is a super stretchy Pontetorto, a blend of polyester and elastane. The materials are all bluesign-approved, assuring full traceability for sustainable fabrics. Against the skin, it’s beautifully soft, with a snug hood and thumb loops. It’s light at 145g.Best for budget warmth
Craghoppers Trina Half Zip Fleece
£55 at craghoppers.com This fleece from Craghoppers — long making quality and sustainable gear at brilliant prices — is wonderfully soft, cosy and really warm. It’s a jacquard fleece, with a raised pattern that is at once comfortable and also traps more air than a traditional fleece. Features include a zipped chest pocket, stretchy underarm panels, thumb holes and a half zip. And at that price, a bargain.Did you know?
All YHA members receive discounts at gear stores including Cotswold Outdoor, GO Outdoors, Snow+Rock, Runners Need and Cycle Surgery.