OmniCore Designs M-3D Hybrid Down Hooded Rectangular Sleeping Bag Technical Comfort: OmniCore Designs wanted to design a truly great sleeping bag. A bag not utilizing all of its technical features for the singular focus of weight reduction but one equally obsessed with comfort. The M-3D line of sleeping bags is our first foray into the world of Technical Comfort. The M-3D Sleeping Bag is powered by our innovative Multi-Down technology. We’ve used our proprietary StratusLoft in the outermost top and bottom layers to maximize warmth insulating performance in wet conditions. In the layer closest to your body, we’ve utilized the amazing heat trapping ability of the all-natural 650-Fill-Power Down. Another key feature designed just for you is 3-D Box Design. The 3D Box Construction allows you to move throughout the night while ensuring the Insulation can keep you warm. Stuffing a 3-dimensional object (humans) into a 2-dimensional structure (most sleeping bags) will cause area's of the insulation to become too compressed, minimizing it's ability to work effectively. By adding 6" sidewalls along the entire bag we've mimic'd the 3D structure that works so well in down clusters, allowing the insulation the necessary room to work it's magic! The 75 Denier DWR-treated Polyester Ripstop repel water when a rainstorm or the morning dew strikes. A zipper on each side of the bag makes escape easy for either of you, and the built-in pillow pocket lets you stuff a fleece in there in case one of you forget your pillow. FEATURES: 3 Section Bottom Storage Storage, Storage, Storage: the 3-section zippered storage on the bottom of the bag allows you to stay organized throughout your trip. Keep your essentials tucked away and out of site. Comfy Hood with Pillow Pocket Sleeping bag hood: A hood offers added warmth, especially when cinched tightly around your head. Pillow pocket: The "pillow pocket" that allows you to stuff clothes or a camp pillow (We Recommend the OmniCore PILLANKET pictured here) to enhance your nights sleep! Stash Pocket Stash pocket: located on the sidewall near the top of the bag, this is handy for keeping small items, such as a phone, watch or any valuables, close at hand Stay On your Sleeping Pad all Night! Sleeping pad compatibility: We've kept the underside insulation on our bags so you will stay warm with or without a sleeping pad. BUT our pad loops and center straps keep you on your sleeping pad all night EXTRA LARGE 110L POLY MESH STORAGE SACK Did You Know: How you store your sleeping bag when not in use will go a long way in determining whether or not your sleeping continues to perform! Why? Whether your sleeping bag is down, synthetic or something truly amazing like the multi-down insulation found in our flagship M-3D line - all insulation (or loft) all works on the same principle: they trap air to keep you warm. For loft to work well, it needs to do just that - stay "lofty" Here's how to extend the life of your sleeping bag! Step 1: Extract it from its stuff sack Step 2: Dry it thoroughly Step 3: Loosely stow it inside the extra-large poly mesh storage sack Step 4: Find a humidity- and temperature-controlled location Extend the life of your sleeping bag COMPRESSION STUFF SACK When to use the COMPRESSION STUFF SACK: Compression stuff sacks are great when minimizing space is a premium! Below are the three easy steps to help you minimize the space needed Step 1: lay the bag flat and "push" out the air pockets inside the bag Step 2: Stuff it, don't roll it! Stuff the sleeping bag inside - we recommend starting from the bottom Step 3: COMPRESSION! Use built-in straps to compress it even more Temperature Rating in Accordance to EN13537 / ISO 23537 Sleeping Bag Temperature Ratings are the MOST frequently asked questions because it's the most confusing! Below are some facts to hopefully help clarify this confusing topic We test ALL of the OmniCore Designs Sleeping Bags in Accordance to EN13537 / ISO 23537The EN13537 / ISO 23537 test is an incredibly specific test that makes some BROAD assumptions such as: using a heated manikin with thermal underwear, on a sleeping pad wearing a beanie etc. The temperature rating on the test only applies to a tiny fraction of people, primarily those who can sleep completely still like the above mentioned manikinFor the rest of us normal humans that move around while sleeping, the EN13537 test provides a universal standard for the industry to allow you to compare "like for like" sleeping bags across brandsThe above chart is an example of what EN13537 / ISO 23537 recommends for the OmniCore Designs -10F sleeping bags. COMFORT RANGE is loosely defined according to the EN/ISO standards as the temperature a "standard" woman is "not feeling cold" in a "relaxed posture"TRANSITION RANGE loosely refers to the "in a situation of fighting against cold but in thermal equilibrium" (i.e. not shivering)EXTREME RANGE this is the temperature most commonly reported industry wide which OmniCore Designs follows. Per the EN/ISO standard "in this range, a strong sensation of cold has to be expected. There is a risk of health damage by hypothermia. A sleeping bag should only be used in this range in an emergency"