Sure, here are some features and details you might want to consider when describing a beer mug:

1. Material: Beer mugs can be made of various materials including glass, ceramic, stainless steel, or even wood. Each material can provide a different aesthetic and level of durability.

2. Capacity: Beer mugs come in various sizes, typically measured in ounces or milliliters. Common sizes range from 12 ounces to 20 ounces, though larger mugs can also be found.

3. Shape and Design: Beer mugs often have a cylindrical shape with a handle for easy gripping. Some may have a tapered design, widening towards the top, while others maintain a consistent width throughout. The design can also vary with decorative elements such as etching, logos, or embossing.

4. Handle: Most beer mugs feature a sturdy handle to make it easier to hold, especially when the mug is filled with a cold beverage. Handles can be simple or ornate, depending on the style of the mug.

5. Insulation: Some beer mugs are designed with double-walled construction to provide insulation, keeping the beer cold for longer periods without causing condensation on the outside of the mug.

6. Weight: The weight of a beer mug can vary depending on the material used. Glass mugs tend to be lighter, while ceramic or stainless steel mugs may have more heft.

7. Base: A stable base is essential for a beer mug to prevent tipping over when placed on a table or bar counter. The base may be flat or slightly rounded.

8. Lip: The lip of the mug can be straight or curved, affecting the way the beer flows into the mouth and the overall drinking experience.

9. Care Instructions: Depending on the material, beer mugs may have specific care instructions. For example, glass mugs are typically dishwasher safe, while some ceramic mugs may require hand washing to preserve their finish.

10. Usage: Beer mugs are versatile and can be used for various types of beer, from lagers and ales to stouts and pilsners. They're also commonly used for serving other beverages like cider or root beer.

These details can help paint a clear picture of what a beer mug looks like and what features it offers to consumers.