Mens Lycra thong. These do have several inches of stretch to them due to the Spandex which helps to ensure the proper fit.
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Men's Underwear - Mens Underwear Store – tagged fabric_stretch
Hotspot Mens Neon Lycra Thong Underwear (Small/Medium) at
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Buy MUQUAM Mens Lycra Lace Thong Underwear (Small, Black) at
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