The Nitestar Alpha 450, recognized for its excellence, features our Alpha insulation technology. This insulation provides superior warmth while significantly improving compressibility, making the bag smaller and lighter than ever. It's an ideal choice for youth groups or for your adventures during the spring and summer seasons. Polair® Hex Shell: Crafted from hexagonal ripstop polyester, this shell fabric is durable, highly breathable, and can be machine washed. Polair® Lining: Made from Polair® polyester, this lining is ultra-soft yet durable and can be easily washed. Alpha Insulation: This lightweight insulation offers exceptional warmth with a high loft, while compressing down to a compact pack size. Mummy-Shaped Sleeping Bag: Tapers from the shoulders to the foot, optimizing pack size and boosting thermal efficiency. Off-Set Double Layer Construction: The offset seams prevent cold spots along the stitching lines. Horizontal Stitching: Maintains insulation in place with evenly spaced stitching for uniform warmth distribution. 3D Hood with Drawcord Closure and Shaped Sides: Protects against heat loss from the head, while the shaped sides enhance comfort. The drawcord closure allows for adjustable fit. Insulated Adjustable Shoulder Baffle: Keeps warmth contained within the sleeping bag. Zip Guard with Anti-Catch Piping: Prevents the zip from catching on the lining, making it easier to open and close. Insulated Zip Baffle: Holds heat inside the sleeping bag and minimizes cold spots. Auto-Lock Two-Way Zip: Adjusts for warmth or ventilation as needed and prevents unintentional opening during the night. Accessible from inside the bag. Woven Zip Puller: Allows for easy and quick zip adjustments. Internal Pocket: Provides handy storage for small personal items. Hanging Loops: Enable easy hanging of the bag for quick drying. Temperature Ratings Independently Measured**: Tested according to EN 23537:2016 standards to ensure accurate temperature ratings and reliability. Limit: -11° Extreme: -31° Comfort: -4° Suggested Min Usage: -9° Tog: 11.0 Suggested Max Usage: 15° Max User Height: 190cm Weight: 2.3 Internal Length: 205cm Packsize: 32.0 x ø24.0cm Performance: 4 Season Internal Foot Width: 48cm Internal Chest Width: 83cm External Chest Width: 85cm Product Segment: Active Fill Type: Insulite Alpha Zip Side: Left Shape: Mummy