This blue nights-colored Belt Booster from Shimoda Designs is intended for use with a Shimoda Designs Explore Backpack. It can combine with a compatible backpack's waist belt to add 10.5", resulting in up 60" of belt circumference. The Belt Booster can help ensure that an Explore Backpack's waist belt remains usable when wearing bulky cold-weather clothing or is always comfortable for Explore Backpack wearers that require a larger-sized fit.