I find that the cell structure of thermic fleece works well to retain body heat as effectively as bulkier heavier fleeces do, so you can travel lighter. The 6% elastine component of the Nexus is spot on. These garments are very comfortable to wear and the pull-on is easy to get on and off. Freedom of movement is assured (a lot more so than pull-ons with lower elasticity such as the Rab Geon). And a mid layer between base shirt and wind shirt on a snowy 30 degree day (it's there, you just can't see it). The collar is very comfortable although I rarely zip it up all the way due to being a heat generating machine even in mid-winter. I need the chimney open to vent! Warmth and breathability are offsetting characteristics, so I have lumped them together. The stretch thermic fleece with its raised oval grid inner pattern seems to help breathing.

The Nexus Full-Zip is, as the name states, the full zip version of the Nexus Pull-On. It is a reliable piece of insulation constructed from Rab's Thermic fleece fabric that traps warm air, keeping you warm and comfortable. It's ideal for colder climbs, summer evening walks and layering during winter activities. It also makes a pretty good casual fleece to wear to the shops or around the house. I highly recommend making the Rab Nexus Pull-On part of your layering system if you are looking for a lightweight fleece layer. The weight, breathability, warmth, and comfort of this fleece are excellent. Rab is a solid outdoor manufacturer that I hope makes more inroads into the US in the future.It is not a stiff collar so flops well but may be affected by poor laundry/folding techniques as it can turn up a bit but that may be due to the layer under it in this case.

Being so light and thin, it layers very well. I wear it in all seasons now from cool summer mornings thrown over a t-shirt... Cold spring and fall mornings and evenings to keep me warm in the sleeping bag while eating... The Rab Nexus Pull-On fleece fits me (6 ft/183 cm and 170 lb/77 kg) very well. It is an athletic fit that works on my frame. The length is about right for me since it extends down past my hip belt, but that will obviously vary based on torso length. I chose the Large size which matched my measurements in the Rab sizing guide, and am happy with that choice. Of course, being fleece you still need an outer layer for wind and rain protection. This is a mid layer. It doesn't do everything, but what it does do it does well (neither version has thumb loops, which pleases me as I detest the things). As with many warranties, its for the "usable lifetime of the product" which could mean a lot, but I guess otherwise they would go out of business replacing clothing thirty years down the road. A lightweight, Thermic™ G stretch fleece midlayer made with 100% recycled fabric, a full length zip and close-fitting collar. Offering superb mobility, breathability and temperature regulation, it's perfect for hiking, climbing and mountaineering.Thermic is a tightly woven fabric made from a mix of polyester and spandex with a smooth outer and a brushed honeycomb inner. It effectively traps warm air and manages moisture to provide warmth and comfort in just about every situation. These kind of "fleece" garments are excellent insulators and are just an all-round brilliant thing to have; they're warm, durable and gloriously simple. I have used the Rab Nexus Pull-On for 18 months in all seasons including approximately 10 weekend 2-3 night hikes in temperatures ranging from around 10 deg F to 80 deg F. It was a commonly worn layer on my 200-mile walk across Scotland in May 2018. I would guess it has seen 30-40 nights out and about 500 miles of all sorts of weather, plus a lot of regular wear. It is made of 94% polyester and 6% elastane. The stretch fleece has two sides to it with different textures. The outer smooth side has what Rab calls a "heathered" effect. Inside is an oval grid pattern to increase warmth and breathability, according to their literature.