The unique gene that gives Curlies their curly hair (which is most obvious with their winter coat) can be expressed minimally (horse exhibits curly hair inside ears, at fetlocks, and a kinky mane and tail), maximally (horse exhibits curl all over body, has dreadlocked mane, and has curly eyelashes and guard hairs), and "Extreme" (very tight, extreme curls, but when they shed out for summer can shed entirely bald) or any variation in between. The coat in the summer shows a slight wave in it, but not as extreme as the winter curls.