Yes, there is a fitted place for your heel.

V-TOE SOCKSV-Toe Split Toe Flip-Flop Socks 3 Pairs Tabi Premium Cotton Blend Mens Womens Socks

V-TOE SOCKSV-Toe Split Toe Flip-Flop Socks 3 Pairs Tabi Premium Cotton Blend Mens Womens Socks

Q: How high (or low) do these socks go? Ankle-high, calf-high, etc?

ankle-high but to the top of the ankle - my feet swell, so the elastic on the ankle was a bit too much for me - I cut it off and only left about 1/4" - after doing this the socks end about an inch above the ankle bone - entire sock is gently elasticized but the sock is very soft and fairly thin - I LOVE THEM!!

Q: Are those non-skid dots on all of the colors?

Hello, No we currently just have one style with the nonskids you can find our nonskid line here: https://www.amazon.com/Black-Non-Skid-V-Toe-Flip-Socks/dp/B00VEG1UEO I hope this helps