Thick 100% Natural Rubber Made - Made of 100% Natural Rubber, non-skid, water-resistant and wear-resisting.
- It's 2.4mm/ 0.094 inch thick, works well to keep the heat in cold weather.
| Explosion-Proof Design - Heavy-stress testing, anti flexion.
- Safe to use.
| Wide Mouth with Rubber Stopper - Tighten rubber stopper and fill pipe end.
- Leakproof, anti rust.
- Keep heat for 3-4 hours if you use them without covering
- The warm time will be longer if you use them in bed under quilt or blanket, for about 6-8 hours.
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