Under Armour Unisex Performance Tech No Show Socks, 6 Pairs Socks (pack of 6)

Q: When washed & dryed, do the socks shrink into a ball? or do they shrink and still lay flat?

They don't shrink, but they do stay flat. I have used these socks with multiple washing and they have not shrunk.

Q: Is this product really as good as advertised?

No. I am not satisfied with these socks. They keep slipping off my heal and end up bunched around my arch. I have to keep pulling them up. I do not recommend them.

Q: How do these compare to Nike?

I don't know about the Nike sock, but these Under Armour suck!! The heal slips down into the shoe and is uncomfortable. Don't waste your money on these.

Q: Thin enough not to make my tennis shoes feel tight and to work under the 100 degree Florida heat and humidity??

I am not an expert on the UA socks but I did discover that UA sells a number of different socks. The type mentioned in this review is not the thinnest - however I have had a hard time finding availability for size XL. Hope this lends some help.