For maximum drag reduction in the water, competitive fit suits should be worn tight to the body. These firm, compressive styles feature full front lining and no bra construction, with Speedo's highest leg height for greater range of kick motion.
Bottom coverage range from ultra-cheeky to full. Size up to reduce compression.
Women's Training (in inches)
| USA Size | 20 | 22 | 24 | 26 | 28 | 30 | 32 | 34 | 36 | 38 | 40 |
| Clothing Size | N/A | N/A | XXS | XS | S | S | M/6 | M/8 | L/10 | L/12 | XL/14 |
| Waist | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29.5 | 31 | 32.5 |
| Hip | 31.5 | 32.5 | 33.5 | 34.5 | 35.5 | 36.5 | 37.5 | 38.5 | 40 | 41.5 | 43 |
| Bust | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 37.5 | 39 | 40.5 |
| Torso | 51.5 | 53 | 54.5 | 56 | 57.5 | 59 | 60.5 | 62 | 63.5 | 65 | 66.5 |
Girl's Youth One Piece (in inches)
| USA Size | 4 | 5 | 6/ Youth 22 | 6X | 7 | 8/ Youth 24 | 10/ Youth 26 | 12/ Youth 28 | 14 | 16 |
| Chest | 21.5-22.25 | 22.25-23 | 23-23.75 | 23.75-24.24 | 24.25-26.5 | 26.5-27.5 | 27.5-28.5 | 28.5-29.5 | 29.5-30.5 | 30.5-31.5 |
| Waist | 21.5-22 | 22-22.5 | 22.5-23 | 23-23.5 | 22.5-23 | 23-23.75 | 23.75-25 | 25-26.25 | 26.25-27.5 | 27.5-28.75 |
| Hip | 22-23 | 23-24 | 24-25 | 25-26 | 26-27.5 | 27.5-28.5 | 28.5-30 | 30-32 | 32-34 | 34-36 |
| Torso | 36.5-38.5 | 38.5-40.25 | 40.25-42 | 42-42.75 | 42.75-44 | 44-46.25 | 46.25-28 | 28-50.5 | 50.5-53 | 53-55.5 |
Toddler Girl's & Apparel
| Size | Weight (lbs) | Length (inch) |
| 12-18 | 22-27 | 26-31 |
| 18-24 | 27-30 | 31-33 |
| 2T | 30-33 | 30-33 |
| 3T | 33-36 | 33-36 |
| 4T | 36-40 | 36-40 |
Infant Size Chart (in inches)
| Speedo Size (based on age) | Chest | Waist | Hips |
| 0-3 months | 17 | 16.5 | 16 |
| 3-6 months | 18 | 17.5 | 17.5 |
| 6-9 months | 18.5 | 18 | 18.5 |
| 9-12 months | 19 | 18.5 | 19 |
| 2 years | 20.5 | 20 |
21 |
| 3 years | 21.5 |
20.5 |
22 |
| 4 years | 22 |
21 |
23 |
| 5 years | 23 |
21.5 |
24 |
| 6 years | 24 |
22 |
25 |
| 7 years | 24.5 |
23 |
26 |
Torso: Start at high point of shoulder, run tape through leg and back up to the starting point.
Bust: Measure the fullest part of the chest, be sure to go over the shoulder blades at back.
Waist: Meausure narrowest part of torso.
Hip: Measure around the fullest point of hip, keeping tape parallel to floor.
Size 26 is unavailable.
