If anyone has access to an endless supply of fitness secrets, it’s the Kardashian-Jenner family. This week, Kylie Jenner let her 220 million Instagram followers in on a crucial component of her workout routine: The new mom and makeup mogul uses Amazon’s best-selling waist trimmer to maintain her midsection.

In a recent Instagram story, Jenner wore the Sports Research Sweet Sweat Waist Trimmer, a Velcro-fastened belt that helps wearers sweat more, which can increase a workout’s intensity and promote the loss of water weight. She paired it with an ivory sports bra and leggings set from Alo Yoga.

The machine washable workout accessory is made of thick, moisture-repelling neoprene, so it won’t absorb the extra sweat you produce as you wear it. Grid-patterned lining and a flexible fit keep the waist trimmer from sliding or bunching during strenuous activity.

The waist trimmer is available in sizes small to XX-Large, and the brand recommends you measure around the widest part of your stomach to find your perfect match. To put it on, simply undo the strap, wrap it around your back, and seal the Velcro over your belly. Reviewers say when you’ve done it right, the belt should feel snug, not restrictive.

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