Constructed of high quality 3mm thick neoprene/nylon laminate, the Standard Scopecoat is designed to fit scopes with standard or low turrets, safeguarding your optics from dust, dirt, dings, scratches and moisture. This slim fit cover is perfect for the field. It is extremely water resistant and draws moisture and condensation away from your scope. You may make it temporarily waterproof with commercial spray-on water repellent, and it is machine washable. Note: The "perfect fit" is a matter of personal preference, ranging between a relaxed fit to a more form-fitted one. Cover can stretch 1-1.5" beyond stated length.This model is black, Small (4). It is compatible with 20mm objective diameter and is 8.5" long.