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Comfortable neoprene and Lycra design with 4-way stretch offers full mobility. Ideal for relieving tight or sore backs due to horseback riding, heavy lifting and sitting for long periods of time. By retaining body heat it provides soothing heat therapy for your lower back. Small: (with a 4" front) Waist Sizes: 22"-38", Medium: (with a 6" front) Waist Sizes: 22"-38", Large: (with an 8" front) Waist Sizes: 24"-40".