In a roller coaster context, "thongs" usually refers to flip-flop footwear, and the rules in 2026 vary by park and ride type. For most standard coasters with a floor, flip-flops are permitted, though there is a high risk of them flying off during high-intensity maneuvers. For "floorless" or "dangling" coasters, most major parks like SeaWorld or Universal will require you to either leave them in a bin on the platform or literally sit on them during the ride to prevent them from becoming dangerous projectiles. Regarding "thong" swimwear at water parks like Disney's Typhoon Lagoon, the dress code strictly prohibits "inappropriate" or "excessively revealing" attire to maintain a family-friendly environment. Generally, standard bikini bottoms are fine, but "G-string" style thongs may result in a request from security to change or cover up before entering the water areas.