Using tarps are the cheapest and affordable option which can be used in different ways.  A tarp is made up of different materials for its specific use.  Tarpaulin can be use against heat and rain.  It can be used in business advertisements and cover from protecting the house, motorcycle, trucks and cars.  They are coated with plastic which makes them water resistant.   If you have investment like boat, it feels so good to ride on it and travel to see beautiful places you want to go. When you feel that it is uncomfortable and hot because of the sunlight, I suggest you purchase a poly tarps which made of different colors and sizes which depends on the size of your boat.  This poly tarp provides UV inhibitor to protect you against the sunlight.  It is useful and effective in providing the protection for your boat.  It is so important to use this tarpaulin in order to protect yourself from heat stroke.