I bought these a few years ago, but I've only tried them on and never actually used them. I didn't have a chance to wear them the year I bought them, and the next year I took them to the beach, but they were too small. When I inspected them for this listing, I found some sand inside. I've removed the sand, but please refrain from purchasing if you are overly concerned about this. There are marks from the original sticker. The soles are made of sturdy rubber, so I think they can be used in rivers or the ocean. Light blue x blue x white, black rubber sole Size can be adjusted with laces and an adjuster. Diving boots with mesh material and non-slip soles. - Color: Blue - Size: 31M - Sole Features: Non-slip - Design: Mesh material - Adjustment: Drawcord Thank you for viewing. #REEFTOURER #Reef Tourer Size #JM #19 - #21cm #WaterPlayShoes #WaterPlayShoes #KidsMarineShoes #Children'sWaterPlayShoes #WaterPlay #RiverPlay #ForOcean #FlipFlops #BeachSandals #Amphibious #WaterShoes #Kids #Children #Boys #BeautifulItem