VivaTherm — Enjoy coffee that empowers you and never stays cold | Kalsten
No more cold coffee – Experience pure power and style in every cup!
Your new coffee companion that keeps you powered throughout the morning. The 20 oz glass cup "VivaTherm" keeps your coffee piping hot or refreshingly cold – for as long as you want. And the leak-proof silicone lid ensures that not a drop spills while you're on the go, whether in the car or at the office. More coffee. More style. Zero stress.
That's why you'll love it
✅ Cult look with wow factor: With art in retro design, you rock every coffee moment. Transparent glass with a cool metallic detail – pure nostalgia and trendy style combined.
✅ Killer glass for true go-getters: High-quality, heat-resistant borosilicate glass keeps your drink warm or cold for an incredibly long time. No cracks, no weaknesses – just pure reliability that stays tough.
✅ Leak-proof silicone lid – No mess, no drama: No more spills – whether on the train, in the car, or at your desk. Your coffee stays exactly where it should: in the cup.
Perfect for all coffee junkies with standards
Whether the boss in the office, dad craving caffeine, or you simply don’t want a lame cup anymore — this mega mug brings personality into your everyday life. 20 oz filled with power coffee, less refilling, more enjoyment. Surprise yourself or your people with a gift that truly makes waves.
| Us | Others | |
|---|---|---|
| ✅ Real heat-resistant borosilicate glass | ✔️ | ❌ |
| ✅ Leak-proof lid for on-the-go | ✔️ | ❌ |
| ✅ Huge 20 oz capacity – less refilling | ✔️ | ❌ |
| ✅ Iconic retro look that turns heads | ✔️ | ❌ |
Technical specifications
• Premium materials: Borosilicate glass that handles heat with ease, combined with a leak-proof silicone lid – robust, safe, stylish.
• Large capacity: 20 oz (approx. 600 ml) – perfect for long, focused coffee moments without annoying refills.
• Handy size & cool style: Approximately 10 x 11 cm, transparent with metallic accents – a real eye-catcher with every coffee. Hand wash recommended for long-lasting enjoyment.
Frequently asked questions
A: Absolutely. The heat-resistant borosilicate glass retains the temperature of your beverages far longer than conventional glasses or cups.
A: No! The silicone lid is completely leak-proof – even on the bumpiest ride.
A: To maintain the stylish metallic detail look, we recommend hand washing. However, the glass is robust and can withstand a lot.
A: With 20 oz (approx. 600 ml), you have plenty of power to enjoy coffee for a long time without constantly refilling. Perfect for your busy workday.
Free standard shipping on all orders. No minimum purchase.
- Ships to: United States
- Processing: 1–4 business days (Mon–Fri)
- Transit: 5–10 business days
- Total delivery time: 6–14 business days
- Order cut-off: 5:00 PM PST
You will receive a tracking number by email once your order ships. Please allow up to 48 hours for tracking to update.
See our full Shipping Policy.
You have 14 days from delivery to request a return.
- Email support@open.shop with your order number to start a return.
- Items must be unused, complete, and in their original packaging.
- Return label: flat $9.99 USD, deducted from your refund — nothing to pay upfront.
- Damaged, defective or incorrect items: we cover all return and replacement costs.
- No restocking fees.
- Exchanges: contact us and mention "exchange" — the new item ships once your return arrives.
- Refunds are issued within 7 business days of inspection.
See our full Return Policy.
Questions about your order or our products? We're happy to help.
Open
Hooizolder 214
Drachten Friesland 9205CD
Netherlands
Email: support@open.shop
Customer Service:
Monday to Friday, 8:00 AM – 6:00 PM PST (excluding public holidays)
We reply to all messages within 24 hours on business days. Weekend messages are answered on Monday.
For quick answers, visit our FAQ page or use our Contact Form.
