Klättermusen shell jackets are designed with a careful balance between breathability, durability, weight, technical details, and wind and waterproofness. It is the different combinations of these factors that create an optimal shell jacket for your needs. Our wide range of all-year-round shell jackets are built to last, season after season, and are made for movement using sustainable materials.

As with all types of outdoor equipment, your intensity and activity of choice is what sets the requirements of the gear. The first question to ask yourself is: Do I need the primary protection to be against water or wind? And secondly: What is the duration of the activity? The requirements of your jacket may differ depending on how long you plan to stay outside. Knowing your conditions and activity helps you decide what main characteristics you are looking for in a shell jacket. Use this guide to determine your needs and find the perfect shell jacket for non-winter months.

MFR

Generally, the more wind and waterproof a garment is, the less breathable it is. Meaning more warm air, heat and moisture will stay trapped inside. Mass Flow Resistance (MFR) is our unique system that provides our products with a simple rating from 1 (most breathable) to 10 (most weatherproof). This lets you easily choose in advance how resistant you want your jacket to be, depending on the conditions you are intending to adventure in.

We recommend a low MRF value for high intensity activities, and a higher MFR for damp, wet and colder activities.

For fast paced activities and hiking during warmer weather, a lightweight and functional windbreaker is the go-to. MFR 2 and 4 means it has limited to fair wind resistance. However, the high breathability will make sure your temperature is regulated when you pick up the pace.

A softshell jacket with MFR 6 is a great choice for high pulse activities, such as fast trekking and hiking. It's also a great companion for everyday activities. The blend between light insulation, good wind protection and light water resistance makes softshell jackets a top choice for a wide range of activities. Only you set the limits.

For trekking and everyday activities, a jacket with MFR value of 8 is ideal. The excellent wind protection will keep you safe and the high-water resistance will keep you dry in the event of light rain. Perfect when the weather slightly shifts during the day.

If you need a year-round fully waterproof jacket, we've got you covered. Fully wind and waterproof jackets with a MFR value of 10 won't let any rain through, if the jacket is cared for properly. Choose between something lightweight and packable for when the rain hits, or an all-round jacket that keeps you safe in all conditions.