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The Lifa Warm from Helly Hansen is a baselayer designed to be used for sports during the colder months. The design consists of a layer of 'Lifa' a smooth polyester type material against the skin which is then covered with merino wool.
The polyester has no absorbancy at all which means that no sweat is stored against the body which can get really cold when you stop for a break it also has pretty much zero heat retention. When wearing a polyester baselayer alone i find i need to wear a snug t-shirt to prevent drafts getting between layers, this often leads to annoying rubbing of seems as the garments do not move as one.
Merino wool is a great material, it has very low water absobancy but still holds heat. For those sensitive types out there as soft merino is I end up with irritation especially around the shoulder and elbow joints. Having the Lifa layer completely negates this.
The seems are flat and positioned so that they do not rub aginast the skin or if you are wearing a ruck sack. This is something that really frustrates me with sports garments and Helly seem to have got this spot on here.
The quarter zip neck means the neck can go higher (around the adams apple) than the standard HH round neck designs for even more warmth. I have quite a large neck in relation to my body size (15.5inch shirt collar, size small) and find doing the zip up all the way leads to a bit of a choking sensation so i typically leave mine undone an inch or so which can get drafty in the very cold but i always keep a Buff handy.
These type of garments need to be fit snug to get the benefit from them, the sizes quoted are pretty realistic but its definately something to try on in store rather than ordering on line. A friend just doesn't fit Helly base layers no matter what size or design. As they fit tight they do tend rise up at those times where you may be carrying a bit of extra 'christmas weight' and they aren't that long so the tall may not be able to tuck them in, so again, the need to try them on in the flesh and do strange dances in the shop to test them out.
The extra warmth i get from this means i've ditched a microfleece, the extra manouvreability is great for active sports and for those keen on minimal weight and packsize they are a great investment. At around £30 they cost the equivalent or less than going for 2 layers.