Ever hear of a Goat-head? If you haven't, count yourself lucky. They are the little Sputnik shaped thorns that can be found on mountain bike trails everywhere. Their scientific name is Tribulus terrestris, and they are not originally from North America. They are considered to be an invasive species, and considered by many to be the most evil plant known to man. Anyway, if you've ridden anywhere theses little guys show up then there's a good chance you've had a few flats as a result. We recently got our hands on some new tires sealant called Blue Seal, and we think it's pretty neat stuff. It's completely none toxic, unlike other commonly available sealants. You can use it in inner tubes or in tubeless systems, so it's a good choice for your commuter bike too. Since it's biodegradable you can just wash it off if you break your valve stem or blow your tire off the rim. Most importantly though, it has an adorable blue seal wearing a cycling cap on the bottle. Ask you're local bike shop to order you some.