What's An Arctic Foxes Physical Characteristics?

Range 50-60 centimeters, at 20-25 cm long tail, 2500 ~ 4000 gram. Smaller and obesity. Mouth, short, slightly shorter round. Short legs. Winter is white, whole body hair tip is only black. Summer is to black hair, ventrally lighter color. Have very close down and less, long tail, hair fleeciness, especially at the white. Range of 50 Celsius degree below zero in on the ice. On the bottoms of the long hair, so can not walk on, skid.