This K Series product has been created for one single reason, to take warmth-for-weight performance to the limit of what's possible. Unique 1000 down, super-light materials, and specific design features mean that the word Ultralight now applies to this wide range of gear that will take you to the Poles as well as on a Sahara Marathon. More on the K Series...
Also available in custom sizes. We make clothing to order, so if you’re not a standard size we can make it to fit. To order a non-standard custom size, select the Custom Sizing tab, choose your body width, and then the body/arm lengths, shorter or longer, that work for you. A custom size takes us a little longer (typically two weeks longer) to make and, because it’s personalized, it’s non-returnable and our customer loyalty scheme can’t be applied.
As steep water ice and mixed test pieces get increasingly technical, so must the kit for the climbers who tackle them: that’s why we designed the Delta “K” Jacket.
However the routes may develop, protection from the cold on frozen stances is still a must, but for modern fast-and-light ascents, so is a good fit, the freedom to move, and minimal weight for maximum warmth.
This exceptionally warm belay jacket houses our unique 1000 fillpower down in box-wall construction, allowing maximum loft and delivering a TOT* rating of -20°C: very reassuring while belaying on frozen waterfalls.
Minimal features and a trim fit mean the Delta can be used in classic belay mode – over the harness when you stop moving – or under the harness for light, easy movement while climbing in deep cold. A fully adjustable, helmet-compatible hood is a given on a serious belay jacket; we’ve teamed it with a high front zip to provide maximum warmth and lock out gnarly conditions. Although clean and uncluttered, there’s no compromise on technical function: features such as high-viz reflective strips for location, glove friendly zip pulls and a clip loop to secure the jacket at change-overs make for a high-spec mountain workhorse.
Down filled Belay jackets really come into their own in dry cold, but obviously the conditions can change: water-resistant protection comes in the shape of Ultrashell fabric and YKK Aquaguard zips, to guard against damp snow or dripping ice if the temperatures rise. If you know you’re heading for wetter conditions though, take a look at our Primaloft filled Belay Jackets.
Please note: this jacket is designed and sized to be worn over the top of outer layers. It provides additional warmth on cold belays and can be swapped between climbers at pitch change-overs. If you want a trimmer, more athletic fit select the next size down.
*TOT: Typical Operating Temperature
Outdoor photography: Paul Horsman.