The shell is impregnated with Bionic-Finish Eco. This water and soil repellent technology is PFC-free and environmentally friendly, combined with better permanence and sustainability. The Hyperion 1 M is a high-quality, functional 3-season (spring, summer, autumn) mummy-shaped sleeping bag with a wide range of applications. It is perfect for camping, hiking, trekking, backpacking, and mountain hiking. High-grade Dura Loft 3D Spiral synthetic filling performs excellently with high insulation capacity. The spiral hollow fiber is durable, thermal sealed, and additionally siliconized, retaining loft and compressibility. The ripstop nylon outer shell is light, smooth, and extremely strong, without stitching at the bottom to reduce cold spots. It features super soft, skin-friendly, and breathable ripstop nylon. The adjustable 3D hood design keeps the head and shoulders warmer during the night. The full-length two-way zipper allows opening the foot area for air circulation, and the zip baffle reduces cold spots for optimal insulation. The anti-zipper guard prevents the zip from snagging on the lining, and the auto lock function prevents the bag from opening while sleeping. The ergonomic-shaped foot area offers extra space for greater freedom of movement and more comfort. The ergonomic-shaped zipper puller helps with easy gripping. An internal zipped pocket provides convenient storage for small items. The compression bag reduces the pack space to a minimum. Maximum user height is 180 cm. Machine washable at 30°C.