A foil blanket is handy to have on you- for most folk the first aid kit you carry will never get used and even if it does it'll mostly get used on you, wouldn't it be fun to disable a leg and find out now you get to lie on the ground cold and wet for a while cos the marshals are "airsofting not climbing" for the sake of something you can get in asda for about a quid?
If you've done any first aid coarse, you'll know what should be in your kit in that regard, if you haven't done one try to get yourself on a basicone with st andrews or st johns etc, about three hours and £20 is the norm, bu