Engineered for the harshest mountain environments, the Crazy Jkt Neutron stands as the most protective jacket in the Crazy collection — a bold fusion of uncompromising weather defense, full elasticity, and cutting-edge insulation. Designed for high-altitude mountaineering and extreme conditions, this jacket delivers complete freedom of movement without sacrificing protection, warmth, or durability.

At its core is a revolutionary fully elastic construction — outer fabric, insulation, and lining all stretch seamlessly with the body. First introduced by Crazy in 2013, this concept redefined technical outerwear and remains unmatched in performance. The outer shell is crafted from Toray Dermizax® nylon, offering dependable waterproof protection with a 20,000 mm water column, while maintaining exceptional softness and mobility.

Strategically taped hood seams and a seamless shoulder panel eliminate weak points in the most weather-exposed areas, ensuring reliable waterproofing where it matters most. Inside, Primaloft® Active insulation provides adaptive warmth that remains breathable, water-repellent, and elastic — ideal for high-output pursuits in cold, variable conditions. Finished with a modern, aggressive design, the Jkt Neutron is as visually striking as it is technically formidable.

Features

• Fully elastic construction: shell, insulation, and lining

• Toray Dermizax® waterproof stretch fabric

• Waterproof rating: 20,000 mm

• Primaloft® Active elastic insulation

• Seamless shoulder construction for enhanced weather protection

• Thermo-taped hood seams

• Designed for extreme alpine and mountaineering conditions

• 4-way stretch outer shell delivers unrestricted movement during technical climbs and demanding terrain

• Laser-cut hand pockets with bonded waterproof zippers reduce bulk and improve durability

• Seam-free shoulder panel eliminates pressure points and prevents water ingress under packs

• Thermo-taped hood with rigid visor provides structured protection against snow and driving rain

• Elastic-edged hood opening ensures a secure, helmet-compatible fit

• Primaloft® Active insulation offers warmth even when damp, with excellent breathability during exertion

• Elasticated hem seals out cold air while maintaining comfort and mobility

Specifications

• Outer Fabric: Toray Dermizax® nylon

• Waterproof Rating: 20,000 mm

• Insulation: Primaloft® Active (elastic, water-repellent)

• Construction: Fully stretch shell, insulation, and lining

• Seams: Thermo-taped hood seams; seamless shoulders

• Pockets: Laser-cut hand pockets with bonded zippers

• Fit: Technical, athletic cut for high-mobility alpine use

• Intended Use: Mountaineering, ski mountaineering, extreme alpine environments