A device for applying compression treatment to a part of a wearer's body includes an S-shaped bladder with at least first and second spaced apart sections in fluid communication. At least one opening is formed between the first and second sections. The at least one opening may a single opening extending along a majority of a length of the first and second sections. The at least one opening may be a plural of openings. At least one opening may be formed between the second section and a third section of the bladder.