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The Smart Toner® by Twist® is specifically designed to perform under the most progressive training style on the planet – SMART Muscle™ Training. A robust sleeve protects the tubing core from pre-mature breakdown, wear, and failure in the field while providing an optimal length tension relationship. The Smart Toner® by Twist® is functional, durable, and made from the highest quality materials. Professional athlete to fitness beginner, we’ve got you covered! Available in 4' (Very Light, Light, Medium, Heavy, Very Heavy, and Ultra Heavy) and 6' (Medium, Heavy, Very Heavy, and Ultra Heavy).