OutdoorGearLab

The Arc'teryx Kyanite AR Hoody scored exceptionally high marks in every metric. It has a great weight-to-warmth ratio and most importantly feels incredibly comfortable. The brushed fleece lining makes it one of the most comfortable fleeces on the market. The slim cut still accommodates wide-set shoulders without creating any hotspots in the armpits or shoulders partially because of the stretchy nature of the fleece. Our testers loved climbing, skiing, and hiking in this piece. The scuba-style hood fits underneath climbing helmets and keeps cold air out while trapping hard-won body heat inside. 
This piece really only has a few downsides. For high output activity in the spring and summer, this fleece offers less-than-perfect breathability when early morning and evening temps are rising. The fleece also lacks thumb loops built into the cuffs. While inconsequential as a stand-alone piece when layering, thumb loops prevent the jacket from bunching up. Ideal for cold-weather pursuits, this jacket provides added warmth when thinner gridded fleece fail. 
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