The vanquito one is mostly magnetic attachment with a couple of Velcro pads. The opening is a zip magnet combo ie can leave it unzipped and it will seal with the magnets making entering and exiting easy. Fits in seconds and is pretty secure and doesn’t foul the sliding door. They do a fine mesh version too, I don’t know if it’s midge proof fine though! Not cheap but well made. I think Berger UK may sell them now which will avoid import duty and fees.