The Marmot Wave IV is a well-proven sleeping bag that manages to keep campers warm in winter for £100. To hit this price the bag has not been made to be as warm as others in our test, so it only has a temperature rating of -10 deg C.
The benefit of shaving a little off the temperature rating is that the weight, packed size and price are lower compared to warmer synthetic bags. The bag features a full-length side zip for venting and a wide shoulder baffle for preventing warm air from escaping. The bag is lined with polyester, with the foot, shoulder baffle and hood benefiting from a brushed treatment to give a much more comfortable and warmer sensation. There is also a pouch for stashing a heater pad in the footbox if you want some extra warmth. If your budget is £100 then the Marmot Wave IV is an outstanding bag, but for extra cash you do get extra warmth.
Outer fabric ripstop nylon
Inner fabric polyester
Compressed packed size 28x24cm
Lower comfort temperature rating -10 deg C
The Marmot Wave IV is the best budget synthetic bag in our review.
Review by Graham Thompson
First published in Trail magazine March 2012