I'm doing the JMT SOBO starting 6/15 with my 12 year old. He's big (5' 6" 110#) so he fits in men's small shirts. He's got a good layering system (thin wool/synthetic shirts, TNF ThermoBall puffy) but his rainshell is a nonbreathable, leaky $25 job that does fine as a scout here in AZ but I think I'd like to upgrade him before this summer.
Any thoughts on an inexpensive (or at least not expensive) rainshell for him? Are FroggToggs really adequate? I don't want him to be miserable (or hypothermic) at 12,000' but I'd like to avoid an expensive shell that he will grow out of in a season.

