These bags have been designed primarily for cold weather and high altitude mountaineers, but also for all adventurers entering hostile environments. The Pertex® Endurance outers offer maximum protection from the elements and top quality down fill gives great warmth for weight.The Summit 300 ½ zip is designed for the summer Alpine climber with a waist high clip-in possibility and minimal features. The Summit 700, 900 and 1100 are designed for more extreme environments with a wide torso area to accommodate down jacket, boots etc Filled with 96% goose down on the top, 90% goose down on the base. Fill power 750+/ 660+ EU 850+/725+ US Trapezoid baffle construction and differential fill ensure maximum insulation and eliminates down shift that can cause cold spots. This also helps to support the baffle and maintain the loft Multi-channelled foot plug enhances warmth around the foot area Hanging loops for storage and airing Supplied with stuff sac and cotton storage sac Newly sculpted hood cowl with deeper sectioned head area provides greater efficiency of insulation around this crucial area Down-filled ‘draught strip’ around the cowl provides a secure and soft feel around the face for increased protection from unwanted draughts One-handed draw cord system allows simple operation of the toggles Improved 3D neck baffle, with one-handed pull drawstring and press stud closure to trap warm air in and keep cold draughts out Enlarged foot plug to provide a better fit for bigger feet Two-way full length YKK zip and down filled zip baffle with improved anti snag detail to stop draughts and heat loss and prevent snagging Available in extra long and extra short options 85cm wide torso accommodates bulky clothing, inner boots, gas etc, standard length fits users up to 188cm (6’2”) Internal mesh pocket useful for drying socks and gloves Available in left and right hand zips Endurance lined hood avoids breathing condensation into the down Weight 1800g Comfort -24°C Dimensions 225 x 85cm Pack size 35 x 23cm