I absolutely love this product the first years has definatly won me over again and again over these last few years as a new parent. and the first years full size bed rail is by far my new lifesaver. or shall i say my new sleep aid! for me and for my two year old big boy after transisitioning to a big bed after my sons crib was recalled we had a horrible time keeping him in bed because he was used to rolling over in to the sides of his crib this bed rail stops that and is soft enough not to hurt a baby at all. it goes uneder the mattress and has a strap that hooks onto the mattress and keeps it in plzce night after night and i have not had to adjust it since firt install it has remained secure! first years is definalty a new faveorit company for making sure excellent childrens products and really keeping my babies safetey in mind the whole time. Next time i am in need of babie products i will check if they make it first since i am so happy with them and this railing!