The Gore-Tex material used in this jacket is designed for active endeavours. To get everything out of your three layer apparel, wear a technical or Merino wool base layer. Falketind products are designed for great versatility, and are a great choice for people who are involved in many outdoor activities. The Falketind GTX is perfect for hiking, climbing, Nordic skating, ski tours and as a general purpose jacket for an outdoor enthusiast. Its surface fabric is much more durable than that of the lightest jackets out there, while its own weight still remains below 400 grams. NEW! This renewed version of the Falketind GTX uses a Gore-Tex ePE membrane which is made of polyethylene. Thus far, Gore-Tex membranes were made of PTFE, a material that has been found to be very problematic environment-wise. - Technical Fit: the second snuggest from the manufacturer's range, still with enough room for a mid layer top - Gore-Tex 3L material: windproof, waterproof, breathable, and 13 mm seam tape -