Very lightweight, very comfortable, I wear them all day long when it is warm out. I put a flash light inside the shoe to see if they were permeable, and no light showed through. It was a special gift for him, as he has done very well in (virtual) school. This is probably one of my favorite performing mice I have owned for gaming. I dont work out or use them when sweaty or in wet weather. Just ordered 2 more. Right out of the box these sandals were very comfortable & fit was spot on. Could not find my size & width on Birkenstock. Sketchers were recommended by a "Professional Health Care" person but I shopped around. Better control means more PWNING.