I must agree with mightymart on the idea of the gauze on the vents keeping crap out, I have found that you end up giving it a beating on the line if the sand is blowing as it is resting on the deck. I have used the 3.5 in 30 mph+ and very exciting with very fast jumps and 30-40foot long. I do find that it does like to overfly in the zenith and an eye needs to be kept on it or it will begin to collapse. Overall, a great kite in big wind for me.