Ultimately luxurious natural mulberry silk fabric and wool batting inside. Optional fixed or removable hood, which reduces noise and increases comfort. Drawstring on the hood and insulation collar for easy adjustment. Hang up airing loops. Climate regulation with a central 2-way zipper. Ykk zipper prevents jamming of material. Internal pocket to store valuables. Rectangular foot box for greater comfort without extra weight. Widest point – in the middle around the arms: 58 cm. Length (from top of zipper to foot). Or any length on request. Shell: 100% natural mulberry silk. Lining: 100% natural mulberry silk. Filling: 100% wool batting (oeko-tex certified). 250 grams of wool batting per square meter (0.55 lbs per square yard). 500 grams of wool batting per square meter (1.1 lbs per square yard). 750 grams of wool batting per square meter (1.65 lbs per square yard). Voc, hap, synthetics, chemical-free. All materials in this sleeping bag are natural, biodegradable, sustainable, and renewable. Do not use chlorine-based bleach. Do not dry clean or use solvents to remove stains. Do not iron or treat with steam. Maximum spin cycle 30 seconds. Machine wash on wool/delicates cycle max. This item is made of mulberry silk and synthetic free, all natural, pure new virgin wool.