Males are about 12.5–17 in (320–630 mm) long. Males can weigh 8–12 oz (230–340 g). Females are a little bit smaller. They are 12–15 in (309–377 mm). Females weigh about 4–8 oz (110–230 g). The summer fur is gray to gray-brown fur with some light yellow. The winter fur is more of a dark yellow with some brown. In both seasons, the underbelly is pale yellow to creamy white.