Heat Training 
Made Easier

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A Smarter Heat Strain Index

Heat Strain Index gives a real-time measure of how hard your body is working to stay cool. After years of extensive laboratory testing, we have improved our Heat Strain Index formula to more accurately represent strain on the body.

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Introducing New Heat Zones

New Heat Zones make it easy to understand the impact your Heat Strain Index is having on your training and racing. Zone 3 will give you optimal heat adaptation benefits in training. Staying below Zone 3 in racing will help you avoid a decrease in your performance.

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New and Improved CORE App Design

In order to improve usability, we’ve redesigned the app user interface with clearer data, visualizations, and information hierarchy.