Durable materials for long service life: stainless steel body with high-quality memory foam padding and UV‑resistant PVC cover stands up to outdoor use and repeated handling. Secure, no‑slip hold: weighted PVC clamp wedges between seat and cushion to anchor the holder so cups and bottles stay put without sliding or tipping. Fits a wide range of drink sizes: holder diameter 7.9 to 8.9 cm and accommodates cups, water bottles, beer cans and coffee tumblers from 10 to 40 ounces. Easy to move and remove: designed for quick repositioning or removal when not needed—no tools required, ideal for flexible use and storage. Weather‑ready construction: UV‑resistant PVC and stainless steel resist sun exposure and moisture common in marine and RV environments. Practical uses Pontoon boat: slip the clamp between seat and cushion to keep drinks secure while cruising or when guests are moving about. Recreational vehicle (RV): install between RV seat and cushion to prevent spills while driving or during camp setup. Quick removal and storage: relocate or remove the holder in seconds for cleaning, stowing, or when changing seating arrangements. What you get A robust, portable cup holder that protects your drink, prevents spills, and adapts to common outdoor and mobile seating arrangements without permanent installation.