REDUCE Glass Tumbler 20oz — Aspen vacuum-insulated borosilicate cup with extra-wide straw & leak-resistant lid

The REDUCE Aspen combines pure glass taste with thermal performance and everyday convenience. Its borosilicate glass body preserves flavor, while the vacuum-insulated sleeve helps keep drinks cold for up to 12 hours. Thoughtful touches—like a soft, furniture-safe base, a reusable wide straw for smoothies and boba, and a lid that fits both glass and sleeve—make this tumbler an adaptable pick for home, commute, or travel.

How long will the Aspen keep my drinks cold?

The Aspen's insulated sleeve and vacuum layer slow heat transfer to maintain chilly beverages throughout your day. For iced coffee, smoothies, and iced teas you can expect up to 12 hours of cold retention under typical conditions. Warm liquids are not recommended for the glass body inside the sleeve.

• Up to 12 hours cold retention with insulated sleeve in place.
• Vacuum insulation reduces temperature transfer and condensation.
• Borosilicate glass preserves flavor without metallic aftertaste.

Is the Aspen safe and easy to clean?

The Aspen uses BPA-free materials and a durable borosilicate glass interior for a safer drinking surface than many plastics. The lid, straw, and insulated sleeve are dishwasher-safe, and the glass body can be rinsed or placed in the top rack depending on your dishwasher's recommendations. Removable parts make deep cleaning straightforward.

• BPA-free components for safer everyday use.
• Removable straw and lid are dishwasher-safe for quick cleaning.
• Borosilicate glass resists stains and retains beverage flavor.

Will the Aspen work with thick drinks like smoothies or boba?

Yes—an extra-wide reusable straw is included so thicker beverages pass easily without clogging. The straw and lid design allows a satisfying sip for textured drinks, and the glass interior resists sticking or lingering tastes. The tumbler’s size and mouth diameter were chosen to accommodate chunky additions like tapioca pearls or thick fruit blends.

• Extra-wide straw fits boba pearls, smoothies, and slushes.
• Large mouth for easy pouring and adding ice or toppings.
• Sturdy glass interior stands up to frequent thick-drink use.

What practical features make this tumbler usable every day?

The Aspen blends practical design with surface protection and portability. The Soft Sit™ base cushions contact with tables to prevent noise and scuffs, while the lid fits both the glass and insulated sleeve for flexible use. It’s sized for most cupholders and built to travel without sacrificing the clean taste of glass.

• Soft Sit™ base protects furniture and reduces clatter.
• Lid and straw fit both glass and insulated sleeve for versatility.
• Cupholder-friendly 20oz profile for commuting and car use.

Who is this for? The REDUCE Aspen is ideal for people who prefer glass for taste clarity but still want modern insulation and portability. Choose it if you drink iced coffee, smoothies, boba, or cold water regularly and want a reusable, dishwasher-safe option that looks good at home, in the office, or on the go.