Standard pool floats max out around 300 lbs.

A standard inflatable pool float will not support two adults, because most are rated for about 250 to 300 pounds.

That “rating” is often not printed on the float itself, so check the product spec before you buy. A basic single-person lounger is usually rated around 200–250 lbs. A bigger raft might claim 300–350 lbs. Meanwhile, two average adults are probably 300–400