A newly marketed vaginal sponge intended to support the urethra was tested during aerobic exercise in a group of 6 women suffering from stress urinary incontinence. The patients performed half an hour of aerobic exercises on 2 consecutive days, with and without the vaginal sponge. A pad was worn during exercise and weighed before and after. Without the vaginal sponge the patients had a mean loss of 7 g (range 2-18 g) during exercise. With the vaginal sponge in situ there was no leakage. The sponge can be recommended for use during sports in patients with mild to moderate incontinence.