full face

I'm wondering when I should be wearing a Full Face lid as opposed to a normal Open Face helmet? I have a couple of planned trips to the Alps and have a niggling thought that A full face would be the better option. When do you guys decide to wear your Full Face? Cheers Crispy

Product Image: Product name: Giro Switchblade MIPS Helmet Price paid: £138 Score (out of 10): 9 Review: After a fairly spectacular pair of unsheduled dismounts left me with a black eye the day before I took SWMBO to Prague for her Xmas present I upgraded my FoxFlux to this Giro...