Geo-gear makes trackable clothing. They are a sponsor of GeoWoodstock IX and will be providing the event t-shirts. They have just announced a full store of trackable GeoWoodstock wear on their website. T-shirts are nice, but I'm partial to hats. The pigment washed charcoal hat with the GeoWoodstock IX logo will join my geocaching hats. All the items offer the option of personalized stitching so you can let others at GWS know who you are. If you order by June 14 and use the code on their website, you can pick up your items at the Fairgrounds.