Gym leggings can feel fine when you first pull them on and distracting ten minutes into a workout. Before choosing a size, check where the waistband sits, how the fabric feels when you bend, and whether the leg length works for you. Start with the size chart on the exact product page, then do a short movement check.
Start with the size chart
Measure your waist and hips, then compare both numbers with the chart on the exact product page. Do not choose by the letter size of a different brand or assume every Athflex style fits identically. If your measurements point to different sizes, check the product fit notes or contact Athflex before ordering.
The waistband should lie flat without digging in. Walk, bend and sit for a few minutes. If you keep pulling it up, or if it folds sharply at the waist, try another size or cut. A waistband that stays put while standing may behave differently during squats or floor work.
Check the fit in motion
Do two or three movements that resemble your usual training: a squat, a lunge and a forward bend are enough for a first check. Notice whether the fabric pulls uncomfortably at the crotch or knees, whether the waistband rolls, and whether the hem shifts to an awkward point on your leg. Wear the underwear you would normally train in when checking coverage. Lighting and stretch can change how fabric looks, so check in bright light and, if possible, ask someone you trust to look from the back while you bend.
This is a personal fit check, not a promise that any pair will be opaque in every light or on every body. Athflex describes several FX leggings as opaque 240 GSM styles, but fabric weight alone cannot guarantee the result for your size, colour and stretch.
Compare the details that matter to you
If you want a wide, high-rise waistband and a concealed back pocket, look at FX Dusk Leggings. The current product page lists curved panels and a full-length, ankle-skimming fit. Check your preferred colour’s images and variant selection before ordering.
FX Stride Leggings list a high-rise flat waistband, curved panels and a flush back pocket for a phone. If carrying a phone matters, check the pocket with your own device during a try-on. The page describes a four-way-stretch, 240 GSM fabric; how secure the leggings feel still depends on the size and how you move.
FX Terra Leggings add mesh calf panels and a concealed back waistband pocket. Their page lists a contoured high-rise waistband and a full-length cut. Choose this style for those design details if they suit your workouts, then check the size chart and current product images.
A quick choice before checkout
Start with your waist and hip measurements. Then decide whether you want the simpler Dusk design, Stride’s phone pocket, or Terra’s mesh panels. Compare the exact colour and size on each product page, since availability and details can change. If you can try them on, keep the pair that lets you move without repeated adjusting. See the current women’s leggings range for all available styles.
Quick answers
Should gym leggings feel tight?
They should sit close enough to move with you without pinching or restricting your usual motions. Use the product size chart, then test the fit by bending, sitting and walking.
How can I check whether leggings stay in place?
Wear them for a short movement check. Squat, lunge, bend and walk. Notice whether you repeatedly pull up the waistband or adjust the legs.
Does 240 GSM mean leggings are squat-proof?
Fabric weight is one detail. Opacity can also depend on colour, fit, stretch, lighting and what you wear underneath. Check the exact pair in bright light when stretched.