I can second that. Timed a 24Hr Ultra (
https://www.webscorer.com/race?raceid=389582) in Upstate NY Winona forest this weekend, with 33 participants. Weather was miserable, rain(hard at times), wind, and cold for most of the event. The course took a beating, got quite muddy in spots. The VUL-BOLT-M730 chips however worked flawlessly. This is my first time using RFID with Webscorer. After reading Joshua's post and contacting him directly to ask how many chips per bib, orientation, foam backed or not, I decided to order up a batch, for my first go. Yes, I used 2 per bib, vertical about 2.5 - 3 inches apart, and no foam backing. 505 total laps completed in those conditions, with participants changing several times, bib were wrinkled, folded, placed in various locations, front, back, side under jackets, ponchos, etc.. Never missed a read. The equipment: 2 impinj R420 readers each connected to one section of Times 7 mat, Travelfy JourneyXTR router, 2 iPad Air's in master helper setup. I think this was a pretty good test of the chips capabilities. Thank you Joshua for this post and Vesa for the detailed setup guides on Webscorer.