Icebreaker M Mer 400 RealFleece Descender LS Z in the colour Black. Icebreaker Men's Merino 400 RealFleece Descender LS Zip is a warm, technical and breathable mid-layer jacket for men, developed for outdoor activities, training and use in cool and cold conditions. The close-fitting cut combines good insulation with effective moisture management and freedom of movement.

The fabric consists of 60% lyocell and 40% merino wool, combining brushed RealFleece™ with TENCEL™. The result is a soft and insulating material that breathes, dries quickly and contributes to natural temperature regulation. The merino wool also has natural odour-resistant properties, making the garment well suited to longer trips and active use.

Strategically placed mesh panels under the arms provide extra ventilation when intensity increases and help release excess heat. Flat seams reduce the risk of chafing and offer good comfort during prolonged use or when worn under other layers. A full front zip makes temperature regulation straightforward, while a chest pocket provides secure storage for small items. Cuffs with thumbholes keep the sleeves in place and offer additional coverage around the wrists.

The jacket weighs 590 grams.