DickiesMen's Dri-Tech Original Moisture Control Crew Socks, Available in M-XXL (6, 12, 18 Pairs)

I wear a size 15 because my foot is big around. Buying socks has been a nightmare as most strangle by lower calf. How are these really for large feet?

There is no size selection option nor is the size listed within the description. What size are these socks?

My shoes size is 8.5, what size fit me? (5-9) or (6-12)?

Are all socks same color? I need all in black color. I see some comments saying they received socks of different colors.