Its 850+ fill power down and 12-denier ExtremeLite fabric combine to create a cozy cocoon of luxurious loft. Use the Blanket Fold collar to trap extra warmth; if it gets too hot, the Thermo Gill vents let you release body heat. Switching to a shorter zipper or a trimmer fit is a potential way to reduce weight, but it can affect comfort. Blanket Fold™ external draft collar and a full-length draft tube provide tucked-in comfort and temperature regulation. Although, many consumers will appreciate that Western Mountaineering is a small company producing all its bags in the USA.

SEA-TO-SUMMIT: Save Up to 60% Off on Last Year's Gear including sleeping bags, pads, and cookware in the Sea-to-Summit Gear Outlet! We're also big fans of the full-length zippers on the Feathered Friends and Western Mountaineering bags. From your local crag to the summit of Everest, at Tiso, you’ll find the climbing and mountaineering equipment you need. This Forte sleeping bag is suitable for three-season use, meaning that in most environments, you can comfortably sleep in it from spring through fall. The Blanket Fold is insulated fabric that you can cover your face with, stuff in around your neck, or leave off if you’re warm.While the above are excellent, for a relatively affordable synthetic bag with plenty of room and features for comfort, we like the Forte and Viola. The Forte’s specifications sheet shows that its lower limit is 31F, so I think naming it as a 35F bag is overly optimistic for many users. So we're delighted to see that the Hyperion's attachment system is designed to be removable, leaving the decision up to you whether the extra weight is worth the benefits. Although warmth is hard to measure objectively, weight is easy, and this is one of the most important metrics to consider for human-powered travel.

It's not hard to find online complaints about bags not living up to their temp ratings, but this could be due to an incomplete setup. The Women's Forte Endless Promise 20 is completed by a Thermo Gill zip ventilation system, which lets you adjust the temperature inside to fit your needs. All the bags we tested include a regular stuff sack or compression sack for storing them inside your backpack.

Add the small comforter that you can literally cover your face with if you want, and I think this bag is quite versatile in its warmth. However, each brand tested their bags in different ways, and it was hard to find a fair comparison between models.