We said we’d already made our warmest sleeping bag a year or two ago with the 233 but this time we really mean it! With 3 times the fill of our lightest weight options, this is the bag for those that sleep cold or are looking to extend their camping season into the colder months.

Like all our sleeping bags, the 303 uses PrimaLoft® Cross-Core Gold Eco insulation, which performs even when wet, if you are inundated. A half-length zip reduces cold spots and overall weight whilst a close-fitting, adjustable mummy-style hood helps trap the maximum of heat. A tapered fit reduces dead air and the shaped footbox makes for a more comfortable sleep position.

Like all our sleeping bags, we take this high-quality insulation and map different weights per panel to ensure the best usage of the fill. The base sheet is filled with PrimaLoft® Cross-Core Gold Eco 133g/m2, whilst the top layer, above the sleeper, is 170g/2 (giving us the 303g/m2 total in the name). Mapping the insulation in this way allows us to achieve such a low pack weight, there is no point placing excess wadding (and therefore weight) beneath the sleeper, as the weight of their body will compress it and reduce its ability to trap air and insulate. Instead, we focus the warmth on the top sheet and leave it up to you to decide what mat to use to insulate you from the ground.