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! There is some sign of pilling from abrasion after 18 months of heavy use, but nothing that has affected the performance of the fleece to date.

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 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). 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 features Rab's 'regular' fit, meaning it sits relatively close to trap as much warmth as possible, yet isn't restrictive during use. 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...

Whether you want to hike, scramble or climb, the Geon Pull-On is the perfect mid-weight layer for reliable dryness and warmth during high-energy cold-weather sport. The double cuffs may not help in this area but I haven't noticed an issue. The Rab Nexus Pull-On breaths well and keeps me warm. Many days in Scotland I wore it almost morning to night as it helped keep warm in the 40s in the morning and breathed well into the 50s and even 60s (with some wind) in the afternoon. The new Geon Pull-On is a mid weight stretch fleece offering low bulk all round insulation for climbing, scrambling and hiking in cold conditions. Incredibly light, incredibly breathable, you would be hard pushed to find a better fleece for hiking and hill walking in the warmer months of the year, or as a layering piece under a shell in cooler conditions. Rab says: 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.

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. 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.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.