I use to run Green SLime in my 35x700s on my Trek 7000 Hybred when cycling out in the BoonDocks here in Bakersfield. One time I counted 20(!!!) Punctures from GOATHEAD Thorns on both tires each! I took the Goatheads out and road on home without any noticable deflation of the tires. I checked the PSI when I got home and they only lost about 5 PSI. ONe this is for sure, you could not ride around the back farm roads here in Kern County without some type of tire protection. Be it from Green Slime or some type of inner tire armor.