It's actually very thick as it's for hail protection.
Yeah, It has four straps which are not done up. One front, rear and two between the wheels. Bit of a pain trying to get it across under the car though as it's lowered and the ground I park on is not that level. Generally, just do the end ones only since it's a snug fit.
It has elastic at both ends, so fits under the front bar very well and the back not so since I have a tow bar. However, it's never blown off in any of the storms I've experienced..
I paid $229 at Nowra Repco two Xmases ago. On special and I've never seen another one since. Trying to get one for my partner's Rav 4 3 door Cruiser.