Proton FL Hoody Mujer

The Proton SL is my go-to for higher output activities (mainly ski touring and resort skiing, but sometimes biking and MTB) because of how breathable it is while still providing warmth and protection from cold and weather. The octa-loft insulation is cozy with a nice next-to-skin feel of a fleece jacket (not slippery or clammy like most puffy jackets) making it comfortable to wear with a tank top or tshirt underneath. I typically layer this piece with either a merino tshirt or a thin baselayer like the Taema for high output/cold weather ski tours and resort days. The outer material has good DWR properties and beads water if there is precipitation, and the octa-loft allows moisture to escape quickly keeping the piece breathable. Once you pop a shell jacket on, the jacket still pulls moisture away from your baselayer to keep you dry but warm. The hood is also the perfect size to wear while skinning if it is windy or precipitating to keep my ears warm and head dry. The layer is not too bulky so it fits well under a shell or under bib pants. I've washed my Proton SL quite frequently and haven't seen huge changes to the loft, with the exception of wearing a backpack I have seen some compression of the octa-loft in the shoulder area and upper back where my backpack weight is but this doesn't seem to change it's ability to keep me warm and dry. I am 5'5", 130lbs with an athletic body type and typically wear a size M in baselayers and jackets with Arc'teryx, and I have a M in this puffy jacket in the Proton SL and it fits perfect for layering. If I were to get this as a lifestyle puffy, I'd probably size up to a L for a more relaxed fit. Best mid-layer for high output activity! I hope Arc'teryx continues to make a version of this layer for many many years. Would love to see more color variety besides just the black and white.