Secret Santa Gift Ideas

Hubs and I are meeting some running friends for a little Christmas cheer this Saturday morning.  We are going for a little trail run and then brunch at a running friends house.  We are supposed to bring a running gift for a "mystery gift" exchange.  Here's the criteria
-10-20$
-unisex
-something a runner would enjoy

I need some creative ideas,  and you guys are amoung the most creative people I know,  so please, HELP!