Ally Mens-Thermal-Underwear-Set SIZE NOTICE Please check OUR SIZE CHART in the image before ordering. Elastic closure Material: Natural rubber Figure 8 resistance band for toning and strengthening Compact size & light weight for easy storage and transport, convenient to use anytime at home and anywhere you go Great for home-based strength training Length x Width x Diameter: 16 x 6 x 0.4 inch