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The wrong underwear can ruin your workout. Smart athletes—like Cristiano Ronaldo—look for breathable and flexible fabrics so their skivvies won't cramp their style or performance. Check out our round-up for four styles that get the job done.

Blue, Green, Textile, Photograph, White, Shorts, Pattern, Light, Aqua, Azure,

Why: Mesh zones in the crotch and back help release steam; when you move, elastic leg grips keep these cotton-Lycra trunks in place.

When: Training, cycling, yoga

Mack Weldon, $24

White, Style, Black, Grey, Fashion design, One-piece garment, Silver, Day dress, Active tank, Active shirt,

Why: The polyester-spandex blend hugs your business and manages your moisture. A pouch keeps your jewels stowed and protected.

When: Tennis, training, running

IZOD Energy, $16

Yellow, Text, Photograph, Snapshot, Metal, Cylinder, Still life photography, Label,

Why: Made of extra-thin microfiber, these feel more like a second skin than boxer briefs. Various ventilation zones keep your boys cool.

When: Training, running, spinning

Calvin Klein Athletic, $30

Textile, Pattern, Grey, Rectangle, Lavender, Label, Silver, Square, Woolen,

Why: Cotton is great for work, not so great for hot yoga. This polyester-rayon-spandex blend quickly wicks away sweat so you can stay focused. 

When: Yoga, Pilates, training

2(X)IST Sweats, $32

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