When pressure cooking and time is finished the valve will automatically go from sealed to venting. I am happy I got them and touring around Barcelona will be a breeze because I wont have to worry about my feet hurting. Only downside is if you plan on putting coats on the bottom hooks, theyre a little too close spacewise for it. The fabric appears to be quite sturdy. Los laterales se notan que son algo peores (eso pasa en el 99% de los ratones, así que es algo normal). The metallic looking part is actually sueded so its super soft. Fit: Very narrow width, extremely tight. Its not ideal, but it does allow me to flawlessly answer or make calls if necessary without stopping or any fumbling or fuss. I mounted according to instructions and even used my own alcohol instead of the wipes. Forget about the included hardwares, they are joke, you will need a trip to Home Depot and spend some extra $.