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The word technical is much overused in the outdoor trade where it is applied to just about everything sold in a bid to make it seem more glamorous. In using it for this section, we apologise, but it does sum up simply the notion of clothing designed to deal with extreme mountain weather.
A "traditional" technical clothing system consists of a Base Layer of quick wicking "thermal" underwear, one or more Mid Layers - usually but not always fleece, and a Shell Layer - usually but not always waterproof.
The idea is that one varies the mid layer and may do away altogether with it and part of the base layer dependent on conditions, and in principal this system applies to just about all mountaineering situations, though there are various flies in the ointment.
The main one of these is that "breathable" waterproofs do not breath well enough for active situations like walking into a crag with a big rucksack on, thus it is almost always better to wear a windproof rather than a waterproof if it is not actually raining. We have two sections devoted to such clothing, Windproofs and Soft Shell, the latter being windproofs made out of tougher, warmer, stretchier (and more expensive) fabrics than general windproofs. In fact sweat build up over several days due to not breathable enough waterproofs can lead to severe chilling when stationary - in such cases, common on expeditions, Buffalo clothing, which works as a combination of base layer, mid-layer and windproof shell combined, and does away with the need for waterproofs, is often a better solution than a layering system.
In addition there are numerous options within the layering system, such as the soft shell/hard shell question and using artificial fibre instead of fleece.
Another more serious problem with layering systems is that in really extreme conditions, taking an outer layer off to put on extra mid-layers may be impossible due to zips icing up etc. Using the Buffalo system or layering up but carrying a "Belay Jacket" as an item to put over the top of everything else are both possible options.
For more information on the questions raised above, please click the relevant section below.
Lightweight outer layers designed for maximum breathability with a high level of windproofness but little rain protection.
Midtweight and heavy duty outer layers designed for very good breathability with a high level of windproofness and some rain protection.
Waterproof and windproof outer layers designed with oodles of breathability (if you read the manufacturer's blurb) and limited breathability if you talk to anyone who's used one.
The Buffalo Double P System was softshell long before anyone had coined the term. A unique way of keeping warm and comfortable in sub-zero temperatures without using waterproofs or underwear.
Mid Layers - Down, Artificial Fibre and Fleece Insulation.
Base Layers - Thermal Underwear and Technical Wicking Tee-Shirts.
Hats, Balaclavas, Headbands, Neck Gaiters, Sun Hats and Mountain Caps.
Gloves and Mitts (including Dachstein Mitts).
Trousers and leggings for everything from mountaineering to fell running.
Gaiters, Socks, Hut Booties and Bivi Boots.
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