I want to say it stops taking in air and lowers drag . At least , the SSTO guides I ' ve watched seem to imply that . <| sep |> Maybe you ' re just more sensitive than me . But after using the regular Always , these were amazing . And nothing on the inch thick cotton saddles my Mom gave me when I first started . <| sep |> It ' s in the bbc article , too . There ' s no ignoring it now . <| sep |> I have learned to swim when I was twelve . I have been on summer holidays with my uncles and they were trying for days to lure me into deep water but I was too afraid to relax . I could swim easily on the places where the water was below my chest but i freezed every time when I was supposed to go deeper . On the day when I finally learned to swim , we were on canoe and suddenly at one moment , my uncle throw me overboard while other jumped into water in case that i need help . i think it was the only way to show me that I can actually swim .