A "rubber raft" refers to a floating boat-like structure made out of rubber or inflatable material. It is used for activities like swimming, crossing water bodies, or having fun in the water. Full definition
The film opens in 1944 with Corporal Allison (Robert Mitchum) alone occupying a small rubber raft, which eventually brings him to Tuasiva, a tropical atoll that is currently the exclusive home of Sister Angela (Deborah Kerr), an Irish nun who has recently buried a priest and missed a ride to safety in Fiji. (dvdizzy.com)
So we put in wood decking, lounge chairs and umbrellas, and we allowed people to bring rubber rafts and beach balls. (articles.chicagotribune.com)
Through my supervisor?s contacts, I got onto a 3 - week rafting trip through the Grand Canyon, shooting rapids on a 4 - meter rubber raft, sleeping rough in the wilderness. (sciencemag.org)