I had two sables that were related and their coats were the same so I just assumed that's what a Sheltie coat was like. Koji, the sable, is tall and his coat doesn't seem to collect stuff. His pants are more coarse, but his body hair is soft. Then I got a tri and wow, her coat is sooooo different. Poor Vogue, her hair seems to love to collect stuff (or maybe because she's smaller and closer to the ground, I have no clue). I always have to brush out her coarser hair near her belly and her pants because it tends to tangle. And her body fur seems softer than Koji's. I had no clue their coats would be so different. She also seems to get dirtier faster, like her hair is oilier and feels grittier faster than Koji's. I can wash Koji twice a year and he's fine. Vogue definitely needs more baths. Again, no clue if it's because she's 14" tall and Koji is pushing 18" (so except for this pants and the fringe on his legs, nothing really touches the ground).
BTW, Koji's hair behind his ears did the crimped thing too when he was young. I even had people ask me why I crimp it. haha. But he grew out of it and it's just fine and straight now. However, when it's wet, it goes back to crimped.