Most freezer cups use a simple chill-and-serve design to help keep drinks cold without diluting them.

• Gel-filled walls: Many mugs have double walls with freezable gel. You place the empty cup in your freezer; the gel solidifies and then absorbs heat from your drink.
• Slushy-maker cores: Some cups have a freezable inner lining. When you pour a chilled, sugary beverage in and gently squeeze, ice crystals form against the cold surface for a slushy texture.
• Best results: Start with a cold beverage, keep the cup out of direct sun, and follow the care instructions on the product page. Performance can vary based on room temperature and drink type.

Not all glass is designed for freezing, and sudden temperature changes can cause cracking.

• Check the label: Only use glass that’s clearly marked “freezer-safe” or made to handle thermal stress.
• Avoid thermal shock: Let hot liquids cool before chilling, and avoid moving a frozen glass directly to a very warm environment.
• Leave headspace: If you’re freezing a liquid, leave room for expansion.
• Consider alternatives: Double-walled plastic or acrylic freezer mugs are commonly designed for this purpose. Reviewing the product’s care guide on the item page can help you choose the right option.

When in doubt, follow the manufacturer’s instructions to reduce the risk of damage.

1. Pre-freeze the cup: Place the empty mug in your freezer for the time recommended in the care guide. Keep it upright and dry for consistent chilling.
2. Start cold: Pour in a chilled beverage. These mugs are intended for cold drinks; hot liquids can affect performance and may damage the cup.
3. Fill sensibly: Don’t overfill. If there’s a lid, secure it to help retain cold.
4. Enjoy and refreeze: Use a handle when available to limit warming by hand. When you’re done, wash as directed and return the dry mug to the freezer for next time.

Instructions vary by model, so it’s a good idea to check the specific product page.

Slushy cups can work with a variety of chilled drinks, and results vary by recipe and model.

• Great picks: Juice, soda, sports drinks, lemonade, and iced coffee often form ice crystals more easily.
• Try thicker treats: Some cups can handle chocolate milk, flavored milk, or pre-chilled smoothie bases. Higher sugar content typically helps with slushiness.
• Tips: Pre-chill your beverage, avoid hot liquids, and consider straining pulpy juices for a smoother texture. If using carbonated drinks, open slowly and leave room for foam.
• Check guidance: Always review your cup’s instructions for compatible beverages and any fill-line recommendations.

Care needs vary by design, so it’s helpful to follow the product’s instructions.

• Washing: Many gel-filled, double‑wall cups are hand-wash only. Use mild soap and a soft sponge to avoid scratching. Disassemble lids and straws for a thorough clean.
• Heat cautions: Unless labeled dishwasher-safe, avoid hot water cycles, boiling, or microwaves.
• Dry completely: Air-dry all parts before refreezing to prevent ice buildup and odors.
• Storage: Store dry in the freezer if the cup is designed to be kept cold, or in a cabinet if not in frequent use. Check the product page for replacement lids or straw options if you need them.