1.Stainless steel insulated protein shaker keeps cold drinks up to 30+ hours cold and keeps hot drinks up to 8 hours warm. Temperature of cold beverages raise only 1.8 degree Fahrenheit per hour in a room temperature of 71 degrees Fahrenheit. 2. It is proven that a twist-on cap is at least two times more secure than a flip-top cap against spilling and leaking and the lid wont burst open when dropped. No more accidental leaking/spilling leaving a mess and ruining your day. Our exclusive patented twist-on cap can be used for hot beverages because the inside air pressure can be released/ gas off through the sides of the twist-on cap while opening it slowly whereas flip-top cant withhold shaking hot drinks. 3. Our premium stainless steel does not absorb odor and is easy to clean without leaving any stains and it wont rust. The last thing you want to have is smelly stinking shaker. 4. Shaker bottle and lid can be washed in a dishwasher. Its dishwasher safe making clean-up so much easier and less hassle. Throw it in overnight and its ready the next morning