Vanguard ADA Systems provides training and licenses for their patented method of installing detectable warnings. Vanguard's truncated domes are entirely seamless, designed specifically so that there is no possible way for water intrusion, and therefore no potential "freeze/thaw heave". Vanguard is also "non-skid" as opposed to "slip resistant". It's simply best in class and it is backed by a 5 Year Replacement Warranty. Vanguard Detectable Warnings are made from 25% recycled materials. A new and profitable way to install the longest lasting detectable warnings nationwide.