DOVAVADri-tech Compression Crew Socks (4/6 Pairs), Comfort Boost Circulation

hello can you tell me how much for a pair of socks are they $ 16.99 each pair or can i get 2 pair for $16.99?

can you put them in the dryer

How long should I expect these socks to ;last? I've had mine for a year?

Are the shoe sizes listed us or other? i have seen reviews were people say the sock they ordered is a size different from their shoe size. i am us 12.