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From active sheet insulation that responds to your output to loose fill insulation that mimics the structure of down, we use a variety of types of PrimaLoft® synthetic insulation in our gear. Each one has its unique benefits, tailored to particular conditions and activities. So how do we select which one to use in each product? Discover how these PrimaLoft® insulations work to provide you wi …

Rab's new fabric, TILT (Thermo Ionic Lining Technology), is used in the inner lining of their top-of-the-line sleeping bags, sleeping mats and down jackets. This technology reflects heat back toward the body, reducing radiative heat loss and increasing warmth. It significantly improves the warmth-to-weight ratio without altering the fabric's original properties or adding weight. At Ultralight Outd …

Our Mountain Manifesto is a set of shared commitments to help us all tread more lightly on the planet. Join us in creating positive change in our industry. Product: Prolong life and performance and minimise the impact of end-of-life. Planet: Drive more sustainable packaging solutions and highlight the environmental impact of air freight. Partner: Improve standards for workers and mi …

Mont-bell's Plasma series are highly advanced ultra-lightweight garments, on this page we explain the three key technologies used to achieve their amazing warmth to weight ratios. —  In simple terms, the benefits of our patented quilting pattern are straightforward construction, reduced seam weight, and improved thermal efficiency. By not forming traditional rectangular boxes or “skippin …

ExpeDRY™ is a new chemical free alternative to WR treated hydrophobic down that performs better in real world situations, assists in consumer care and uses 70% fewer resources to produce.The Alpine 850 Nano Hoodie is filled with 60g (Medium) of goose down, which has non-toxic gold particles bonded to it for fast-drying performance and industry-leading warmth. The inert, chemical-free t …

Alpha is one of a range of insulation from Polartec, we explain what it does and include our opinion of it.

Down is the natural plumage that forms the undercoating of waterfowl. It forms in tufts, or plumules, and consists of fluffy, wispy filaments. It is an exceptional insulator, prized for being light, easy to compress, durable and breathable. It excels in cold, dry conditions. Down is more expensive than synthetic fill, but it maintains its loft (which provides its heat-trapping ability) at a near-o …

Generally the more down in a jacket (fill weight), the warmer it is going to be but this assumes the down is the same quality. However, down quality can vary significantly and is measured by its fill power. A higher fill power down will keep you warmer than a lower fill power. To make matters worse there are two widely recognised methods of measuring Fill Power - the 'US' Method and the 'EU' Metho …

When down gets wet, it will lose most of its insulation properties but this is where Hydrophobic down comes in - this is a relatively new concept and the purpose is to solve the main drawback of 'regular' down, which is it's lack of effectiveness when wet.Hydrophobic down has been treated with a durable water repellent that enables the down to dry quicker and resist water for longer, meaning it wi …

A Box-wall down jacket is one that utilises 'Box-wall' construction for it's baffles. Baffles are the pockets of space that are created between two layers of fabric which then hold the goose or duck down that is in your jacket. These chambers filled with down are how the jacket keeps you warm. Your body heat warms the air around it through radiating that heat, when you are wearing a down jacket th …

Alpha Direct is one of a range of insulation from Polartec, we explain what it does and include our opinion of it.

There are three main types of synthetic insulation and we discuss them here and give other advbice on choosing sythetic garments.