It being a night in early September, even sleeping out under the stars on a rather breezy ledge, I hoped I would if anything to be too warm. The Mountain Hardware Hyperlamina Flame sleeping bag has a comfort temperature rating of -9°C meaning it shouldn’t have any problem coping in these conditions.
Looking at the pack, the size seems very good especially for a synthetic bag, but more than anything its light weight seems exceptional. Getting in was a doddle as the single front half zip seems a superior option to the traditional side zip and with the dual sliders certainly allows easy ventilation.
Zipping the bag up was a bit fiddly due to the insulation strip that covers it, but I’m sure the few seconds fiddling is worth the extra warmth it brings. The draft collar is comfortably loose whilst still reducing heat loss.
Overall this seems like an exceptional sleeping bag and as predicted, waking up sweating half way through the night, I opted to only use the bag for my bottom half, using a t-shirt and fleece hoody for my torso. It would be great to test this bag in more challenging conditions, but I certainly believe it lives up to its claimed performance.
Tom Baggott is on the Pure Outdoor instructor Training Scheme at Pure Outdoor in the Peak District.