When shopping for activewear leggings, fit and comfort are key factors that make all the difference during workouts. From my experience trying on the Oner Active leggings, I found that sizing down from an XL to a Large proved beneficial, especially for dynamic movements like squats. The XL size leggings tended to slip down during exercise, which was distracting and required readjusting. It's helpful to have reference points, so knowing my height of 164 cm and weight around 71 kilos helped me pick the Large size, which felt snug yet comfortable without restricting movement. For context, I usually wear a size 8 (Medium) in Lululemon leggings, indicating that Oner Active sizing may run slightly larger or have a different fit cut. Leggings fabric, waistband design, and stretchiness all influence their performance during gym sessions. Some leggings with thicker, high-rise waistbands offer more grip around the hips, preventing slipping. Oner Active's leggings provide a nice balance of stretch and compression, but sizing properly is crucial to benefit from this support. In my experience, trying the leggings on and doing movements like squats or lunges in the fitting room—or at home—helps determine if a size will stay put. If they slide down easily, sizing down or looking for a model with a more secure waistband might be the solution. For those considering activewear purchases, especially from brands like Oner Active, always check sizing charts and reviews that offer real user feedback. Comparing with similar brands like Lululemon can guide expectations. Ultimately, personal comfort and confidence during workouts should guide your choice to ensure your gym outfit supports your performance.