Mountain Equipment Helium GT

While it maintains the efficiency of a mummy shape, the Helium GT 400 is cut wider than traditional performance bags. This gives you extra room to shift your knees or sleep on your side without feeling constricted.

The 23-degree rating is a comfort-focused limit, making this bag highly versatile for spring and summer alpine trips where temperatures can drop unexpectedly at night. It provides a solid buffer against chilly mountain air, though you should pair it with a high-R-value sleeping pad for maximum effectiveness.

Yes, the magnetic closure is designed to be secure yet easy to operate, even in the dark. It effectively seals the draft collar to trap heat around your core without the fiddliness of traditional snaps or Velcro.

At 1.96 lbs, it is lightweight enough for multi-day backpacking trips where every ounce counts. The high-quality 700-fill duck down compresses significantly, allowing it to pack down small enough to leave plenty of room in your pack for other gear.

This construction method prevents the down insulation from shifting or clumping, which creates cold spots. By keeping the down evenly distributed, the baffles ensure consistent warmth throughout the entire bag.

Yes, the bag is designed to accommodate users up to 72 inches, or 6 feet, in height. If you are right at that limit, you will have a snug fit, but the anatomical foot-box is shaped to prevent your feet from compressing the insulation.