REDUCE Aspen 591 ml Glass Tumbler — Vacuum-Insulated Borosilicate with Extra-Wide Straw & Dishwasher-Safe Sleeve

The REDUCE Aspen 20oz is a vacuum-insulated borosilicate glass tumbler with a dishwasher-safe sleeve, an extra-wide straw for thick drinks, and a soft base to protect surfaces.

This tumbler merges the clean taste of glass with modern thermal performance and everyday convenience. Built from durable borosilicate glass and paired with a vacuum-insulated outer sleeve, the Aspen keeps cold drinks refreshing while the wide straw handles boba, smoothies, and shaken iced beverages. Thoughtful details—like a Soft Sit™ base, a lid that fits both glass and sleeve, and BPA-free materials—make it a practical, sustainable choice for at-home and on-the-go use.

How long will the REDUCE Aspen keep my drinks cold?

The Aspen uses a vacuum-insulated sleeve around borosilicate glass to slow heat transfer and preserve chill. For best results with ice-based beverages, you can expect up to 12 hours of cold retention under typical daily use.

• Vacuum-insulated sleeve reduces temperature change.
• Borosilicate glass keeps flavor neutral—no metallic taste.
• Use with ice or pre-chilled liquids for longest cold life.

Can it handle thick drinks like smoothies and bubble tea?

Yes—Aspen includes an extra-wide straw designed for denser textures. The straw’s diameter and the spill-resistant lid make sipping thick beverages comfortable and mess-minimized.

• Extra-wide straw fits tapioca pearls and fruit chunks.
• Secure lid reduces splashes while drinking on the move.
• Glass mouthpiece preserves flavor compared with plastics.

Is the tumbler easy to clean and safe for daily use?

The Aspen’s glass components are dishwasher-safe, and the insulated sleeve and lid are designed for simple cleaning. All parts that contact liquids are BPA-free, giving a safer, more natural drinking experience.

• Borosilicate glass resists staining and odor retention.
• Lid and straw are removable for thorough washing.
• Dishwasher-safe sleeve streamlines routine care.

What surface protection and portability features does it offer?

The Soft Sit™ base cushions the tumbler to avoid clattering and protect tables from scratches. The sleeve also makes the tumbler cupholder-friendly and helps insulate while you carry it in a bag or place it in a car cupholder.

• Soft Sit™ base prevents marks and reduces noise.
• Sleeve shape fits most cupholders for easy travel.
• Lid locks to both glass and the insulated sleeve for flexible use.

Who is this for: The REDUCE Aspen 20oz is aimed at people who want the clean taste of glass with improved thermal performance—commuters, smoothie and boba fans, and anyone who values easy cleaning and surface-safe drinkware. It suits users looking for a reusable, BPA-free tumbler that accommodates thick beverages and travels well between home, work, and errands without sacrificing style or function.