Energy Del Sol FPM-68 68 Watt Flex Solar Power Mat For Recreational Vehicles and Boats This product was designed to be extremely strong and durable and to withstand major impacts. In fact, you can walk on it which allows you unrestricted roof access. It is also highly resistant to UV ray's being made high quality EPDM synthetic rubber Shadow tolerant, low light performance collects energy even from indirect sunlight by use of bypass diodes which allow for more efficient energy production even on overcast/dull days Aerodynamic, low profile design along with it's flexibility allows the Flex Power Mat to conform easily to the roof design of your RV, cabin, boat or manufactured home Easy Do-It-Yourself Installation. Self Gasketing Design to prevent any leakage. No metal parts to mess with, no climbing up on top of your roof to re-adjunct your panel any time you want to travel Energy Del Sol recommends that all FLEX POWER MAT be professionally installed by a certified solar installer