The Helium 400 is a sleeping bag designed by the brand Mountain Equipment to offer you lightweight insulation from March to September. Although this sleeping bag is lightweight, it remains warm and insulating. Indeed, the Helium 400 is filled with duck down, providing excellent insulation. Additionally, the Helium fabric is dense, offering a high level of wind resistance and thus minimal heat loss. Moreover, the slanted box-wall baffles not only reduce the weight of the sleeping bag but also ensure the down is well-distributed within the sleeping bag for effective insulation. Finally, the Bulls Eye™ technology located at the foot box helps limit the migration of down towards the bottom, always with an eye on lightness and compressibility. The HELIUM™ 20 outer shell is very lightweight and highly breathable Pure duck down 90-10 with a minimum fill power of 700 The Alpine fit maximizes thermal efficiency Slanted box-wall baffles all around Mid-level side seams 5-baffle anatomically shaped hood 4-baffle anatomically shaped and offset foot box Full-length baffle with Gemini™ zipper and integrated collar with Lode Lock™ closure Comes with a waterproof storage sack and a storage cube Comfort temperature: 3°C Limit temperature: -3°C Extreme temperature: -19°C Fill power: 700 cuin Helium 400: Regular Length: 180 cm Shoulder width: 75 cm Foot width: 50 cm Maximum user height: 170 cm Packed dimensions: 23 x 19 x 17 cm Fill weight: 367 g Weight: 845 g Helium 400: Long Length: 195 cm Shoulder width: 75 cm Foot width: 50 cm Maximum user height: 185 cm Packed dimensions: 24 x 20 x 17 cm Fill weight: 385 g Weight: 865 g Mountain Equipment Helium 400 - Sleeping bag - Women's