Essential info
Essential info

Benefits
Benefits

SONIC RA PRO 2 W
Quick Transition
For the Pro, the Geometric Decoupling™axis is oriented to deliver a fast and efficient forward transition.
Performance Fit
The road-specific, lightweight Sensifit upper with engineered mesh conforms to the contours of your foot and secures it in place, for dynamic comfort without added weight.
Vibration Dampening
The unique Vibe Technology midsole construction uses EnergyCell™+and Opal to attenuate fatigue-causing vibrations for a cushioned yet responsive ride.
Technologies
Technologies
OUTSOLE
Geometric Decoupling™
Geometric Decoupling™ works with the foot to allow smooth and efficient load guidance, creating an effortless and efficient heel to toe transition.
MIDSOLE
Vibe™
Vibe Technology is the combination of EnergyCell™+, Opal, a unique assembly that works as a system to attenuate vibrations and reduce a potentially harmful load to the body, while delivering a responsive ride.
UPPER CONSTRUCTION
SensiFit™
SensiFit™ cradles the foot from the midsole to the lacing system, providing a secure, snug, and virtually customized fit all around the foot.
Blown rubber Contagrip®
Super lightweight rubber formula for a cushy feel and ground sensation.
Contagrip® FA
Contagrip® FA combines flat, wide lugs for friction grip on flat, hard surfaces, with a compound that balances durability and adhesion. Ideal for road running.
EnergyCell™+
EnergyCell™+ is a high-rebound midsole compound that provides exceptional energy return along with substantial cushioning and durability.
Mesh and textile lining
A soft, breathable lining for extreme comfort.
Welded collar binding
Seamless collar construction for improved comfort.
Welded upper
Stitch-free upper construction provides a smooth, glove-like, fit and feel.
Molded EVA
A molded sockliner that improves comfort by mimicking the foot's natural shape.
Regular laces
Traditional lacing system with eyelets.
Materials & Maintenance
Materials & Maintenance
Textile
Synthetic
Rubber
Synthetic / Textile
Reviews
Reviews
Men's Footwear
Calculate your own measurements, then select your product size
Our wide fitting models (X-ULTRA WIDE, SPEEDCROSS WIDE, XA PRO WIDE) have approx.+12mm increase in forefoot volume vs standard fit
ORDER SIZE | FOOT LENGTH (INCH) | EUR | US | JP |
3.5 UK | 8.5 | 36 | 4 M | 22 |
4 UK | 8.7 | 36 2/3 | 4.5 M | 22.5 |
4.5 UK | 8.9 | 37 1/3 | 5 M | 23 |
5 UK | 9.1 | 38 | 5.5 M | 23.5 |
5.5 UK | 9.3 | 38 2/3 | 6 M | 24 |
6 UK | 9.4 | 39 1/3 | 6.5 M | 24.5 |
6.5 UK | 9.6 | 40 | 7 M | 25 |
7 UK | 9.8 | 40 2/3 | 7.5 M | 25.5 |
7.5 UK | 10 | 41 1/3 | 8 M | 26 |
8 UK | 10.2 | 42 | 8.5 M | 26.5 |
8.5 UK | 10.4 | 42 2/3 | 9 M | 27 |
9 UK | 10.6 | 43 1/3 | 9.5 M | 27.5 |
9.5 UK | 10.8 | 44 | 10 M | 28 |
10 UK | 11 | 44 2/3 | 10.5 M | 28.5 |
10.5 UK | 11.2 | 45 1/3 | 11 M | 29 |
11 UK | 11.4 | 46 | 11.5 M | 29.5 |
11.5 UK | 11.6 | 46 2/3 | 12 M | 30 |
12 UK | 11.8 | 47 1/3 | 12.5 M | 30.5 |
12.5 UK | 12 | 48 | 13 M | 31 |
13 UK | 12.2 | 48 2/3 | 13.5 M | 31.5 |
13.5 UK | 12.4 | 49 1/3 | 14 M | 32 |
14 UK | 12.6 | 50 | 14.5 M | 32.5 |
14.5 UK | 12.8 | 50 2/3 | 15 M | 33 |
Our wide fitting models (X-ULTRA WIDE, SPEEDCROSS WIDE, XA PRO WIDE) have approx.+12mm increase in forefoot volume vs standard fit
ORDER SIZE | FOOT LENGTH (CM) | EUR | US | JP |
3.5 UK | 21.5 | 36 | 4 M | 22 |
4 UK | 22 | 36 2/3 | 4.5 M | 22.5 |
4.5 UK | 22.5 | 37 1/3 | 5 M | 23 |
5 UK | 23 | 38 | 5.5 M | 23.5 |
5.5 UK | 23.5 | 38 2/3 | 6 M | 24 |
6 UK | 24 | 39 1/3 | 6.5 M | 24.5 |
6.5 UK | 24.5 | 40 | 7 M | 25 |
7 UK | 25 | 40 2/3 | 7.5 M | 25.5 |
7.5 UK | 25.5 | 41 1/3 | 8 M | 26 |
8 UK | 26 | 42 | 8.5 M | 26.5 |
8.5 UK | 26.5 | 42 2/3 | 9 M | 27 |
9 UK | 27 | 43 1/3 | 9.5 M | 27.5 |
9.5 UK | 27.5 | 44 | 10 M | 28 |
10 UK | 28 | 44 2/3 | 10.5 M | 28.5 |
10.5 UK | 28.5 | 45 1/3 | 11 M | 29 |
11 UK | 29 | 46 | 11.5 M | 29.5 |
11.5 UK | 29.5 | 46 2/3 | 12 M | 30 |
12 UK | 30 | 47 1/3 | 12.5 M | 30.5 |
12.5 UK | 30.5 | 48 | 13 M | 31 |
13 UK | 31 | 48 2/3 | 13.5 M | 31.5 |
13.5 UK | 31.5 | 49 1/3 | 14 M | 32 |
14 UK | 32 | 50 | 14.5 M | 32.5 |
14.5 UK | 32.5 | 50 2/3 | 15 M | 33 |

- Place a sheet of paper on the floor and against a wall
- Make sure you are wearing the same socks that you would normally wear with this type of shoe
- Wearing these socks, stand on the sheet of paper with your foot perpendicular to the wall and your heel against the wall.
- Then use a pen to draw a line just in front of your big toe. Repeat for both feet and take the longer distance to determine your size.
- Using a ruler, measure the distance between the wall and the line you drew to find your size.
Women's Footwear
Calculate your own measurements, then select your product size
Our wide fitting models (X-ULTRA WIDE, SPEEDCROSS WIDE, XA PRO WIDE) have approx.+12mm increase in forefoot volume vs standard fit
ORDER SIZE | FOOT LENGTH (INCH) | EUR | US | JP |
3.5 UK | 8.5 | 36 | 5 | 22 |
4 UK | 8.7 | 36 2/3 | 5.5 | 22.5 |
4.5 UK | 8.9 | 37 1/3 | 6 | 23 |
5 UK | 9.1 | 38 | 6.5 | 23.5 |
5.5 UK | 9.3 | 38 2/3 | 7 | 24 |
6 UK | 9.4 | 39 1/3 | 7.5 | 24.5 |
6.5 UK | 9.6 | 40 | 8 | 25 |
7 UK | 9.8 | 40 2/3 | 8.5 | 25.5 |
7.5 UK | 10 | 41 1/3 | 9 | 26 |
8 UK | 10.2 | 42 | 9.5 | 26.5 |
8.5 UK | 10.4 | 42 2/3 | 10 | 27 |
9 UK | 10.6 | 43 1/3 | 10.5 | 27.5 |
9.5 UK | 10.8 | 44 | 11 | 28 |
10 UK | 11 | 44 2/3 | 11.5 | 28.5 |
10.5 UK | 11.2 | 45 1/3 | 12 | 29 |
11 UK | 11.4 | 46 | 12.5 | 29.5 |
11.5 UK | 11.6 | 46 2/3 | 13 | 30 |
12 UK | 11.8 | 47 1/3 | 13.5 | 30.5 |
12.5 UK | 12 | 48 | 14 | 31 |
13 UK | 12.2 | 48 2/3 | 14.5 | 31.5 |
13.5 UK | 12.4 | 49 1/3 | 15 | 32 |
14 UK | 12.6 | 50 | 15.5 | 32.5 |
14.5 UK | 12.8 | 50 2/3 | 16 | 33 |
Our wide fitting models (X-ULTRA WIDE, SPEEDCROSS WIDE, XA PRO WIDE) have approx.+12mm increase in forefoot volume vs standard fit
ORDER SIZE | FOOT LENGTH (CM) | EUR | US | JP |
3.5 UK | 21.5 | 36 | 5 | 22 |
4 UK | 22 | 36 2/3 | 5.5 | 22.5 |
4.5 UK | 22.5 | 37 1/3 | 6 | 23 |
5 UK | 23 | 38 | 6.5 | 23.5 |
5.5 UK | 23.5 | 38 2/3 | 7 | 24 |
6 UK | 24 | 39 1/3 | 7.5 | 24.5 |
6.5 UK | 24.5 | 40 | 8 | 25 |
7 UK | 25 | 40 2/3 | 8.5 | 25.5 |
7.5 UK | 25.5 | 41 1/3 | 9 | 26 |
8 UK | 26 | 42 | 9.5 | 26.5 |
8.5 UK | 26.5 | 42 2/3 | 10 | 27 |
9 UK | 27 | 43 1/3 | 10.5 | 27.5 |
9.5 UK | 27.5 | 44 | 11 | 28 |
10 UK | 28 | 44 2/3 | 11.5 | 28.5 |
10.5 UK | 28.5 | 45 1/3 | 12 | 29 |
11 UK | 29 | 46 | 12.5 | 29.5 |
11.5 UK | 29.5 | 46 2/3 | 13 | 30 |
12 UK | 30 | 47 1/3 | 13.5 | 30.5 |
12.5 UK | 30.5 | 48 | 14 | 31 |
13 UK | 31 | 48 2/3 | 14.5 | 31.5 |
13.5 UK | 31.5 | 49 1/3 | 15 | 32 |
14 UK | 32 | 50 | 15.5 | 32.5 |
14.5 UK | 32.5 | 50 2/3 | 16 | 33 |

- Place a sheet of paper on the floor and against a wall
- Make sure you are wearing the same socks that you would normally wear with this type of shoe
- Wearing these socks, stand on the sheet of paper with your foot perpendicular to the wall and your heel against the wall.
- Then use a pen to draw a line just in front of your big toe. Repeat for both feet and take the longer distance to determine your size.
- Using a ruler, measure the distance between the wall and the line you drew to find your size.
Unisex Footwear
Calculate your own measurements, then select your product size
Our wide fitting models (X-ULTRA WIDE, SPEEDCROSS WIDE, XA PRO WIDE) have approx.+12mm increase in forefoot volume vs standard fit
ORDER SIZE | FOOT LENGTH (INCH) | EUR | US - WOMEN | US - MEN |
3.5 UK | 8.5 | 36 | 5 W | 4 M |
4 UK | 8.7 | 36 2/3 | 5.5 W | 4.5 M |
4.5 UK | 8.9 | 37 1/3 | 6 W | 5 M |
5 UK | 9.1 | 38 | 6.5 W | 5.5 M |
5.5 UK | 9.3 | 38 2/3 | 7 W | 6 M |
6 UK | 9.4 | 39 1/3 | 7.5 W | 6.5 M |
6.5 UK | 9.6 | 40 | 8 W | 7 M |
7 UK | 9.8 | 40 2/3 | 8.5 W | 7.5 M |
7.5 UK | 10 | 41 1/3 | 9 W | 8 M |
8 UK | 10.2 | 42 | 9.5 W | 8.5 M |
8.5 UK | 10.4 | 42 2/3 | 10 W | 9 M |
9 UK | 10.6 | 43 1/3 | 10.5 W | 9.5 M |
9.5 UK | 10.8 | 44 | 11 W | 10 M |
10 UK | 11 | 44 2/3 | 11.5 W | 10.5 M |
10.5 UK | 11.2 | 45 1/3 | 12 W | 11 M |
11 UK | 11.4 | 46 | 12.5 W | 11.5 M |
11.5 UK | 11.6 | 46 2/3 | 13 W | 12 M |
12 UK | 11.8 | 47 1/3 | 13.5 W | 12.5 M |
12.5 UK | 12 | 48 | 14 W | 13 M |
13 UK | 12.2 | 48 2/3 | 14.5 W | 13.5 M |
13.5 UK | 12.4 | 49 1/3 | 15 W | 14 M |
14 UK | 12.6 | 50 | 15.5 W | 14.5 M |
14.5 UK | 12.8 | 50 2/3 | 16 W | 15 M |
Our wide fitting models (X-ULTRA WIDE, SPEEDCROSS WIDE, XA PRO WIDE) have approx.+12mm increase in forefoot volume vs standard fit
ORDER SIZE | FOOT LENGTH (CM) | EUR | US - WOMEN | US - MEN |
3.5 UK | 21.5 | 36 | 5 W | 4 M |
4 UK | 22 | 36 2/3 | 5.5 W | 4.5 M |
4.5 UK | 22.5 | 37 1/3 | 6 W | 5 M |
5 UK | 23 | 38 | 6.5 W | 5.5 M |
5.5 UK | 23.5 | 38 2/3 | 7 W | 6 M |
6 UK | 24 | 39 1/3 | 7.5 W | 6.5 M |
6.5 UK | 24.5 | 40 | 8 W | 7 M |
7 UK | 25 | 40 2/3 | 8.5 W | 7.5 M |
7.5 UK | 25.5 | 41 1/3 | 9 W | 8 M |
8 UK | 26 | 42 | 9.5 W | 8.5 M |
8.5 UK | 26.5 | 42 2/3 | 10 W | 9 M |
9 UK | 27 | 43 1/3 | 10.5 W | 9.5 M |
9.5 UK | 27.5 | 44 | 11 W | 10 M |
10 UK | 28 | 44 2/3 | 11.5 W | 10.5 M |
10.5 UK | 28.5 | 45 1/3 | 12 W | 11 M |
11 UK | 29 | 46 | 12.5 W | 11.5 M |
11.5 UK | 29.5 | 46 2/3 | 13 W | 12 M |
12 UK | 30 | 47 1/3 | 13.5 W | 12.5 M |
12.5 UK | 30.5 | 48 | 14 W | 13 M |
13 UK | 31 | 48 2/3 | 14.5 W | 13.5 M |
13.5 UK | 31.5 | 49 1/3 | 15 W | 14 M |
14 UK | 32 | 50 | 15.5 W | 14.5 M |
14.5 UK | 32.5 | 50 2/3 | 16 W | 15 M |
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- Place a sheet of paper on the floor and against a wall
- Make sure you are wearing the same socks that you would normally wear with this type of shoe
- Wearing these socks, stand on the sheet of paper with your foot perpendicular to the wall and your heel against the wall.
- Then use a pen to draw a line just in front of your big toe. Repeat for both feet and take the longer distance to determine your size.
- Using a ruler, measure the distance between the wall and the line you drew to find your size.
Kid's Footwear
Calculate your own measurements, then select your product size
ORDER SIZE | FOOT LENGTH (INCHES) | EUR | US |
8.5K | 6.3 | 26 | 9K |
9.5K | 6.5 | 27 | 10K |
10K | 6.7 | 28 | 10.5K |
10.5K | 6.9 | 29 | 11.5K |
11.5K | 7.3 | 30 | 12K |
12.5K | 7.5 | 31 | 13K |
13.5K | 7.9 | 32 | 1 |
1 | 8.1 | 33 | 1.5 |
2 | 8.3 | 34 | 2 |
2.5 | 8.5 | 35 | 3 |
3.5 | 8.7 | 36 | 4 |
4 | 8.9 | 37 | 5 |
5 | 9.3 | 38 | 6 |
ORDER SIZE | FOOT LENGTH (CM) | EUR | US |
8.5K | 16 | 26 | 9K |
9.5K | 16.5 | 27 | 10K |
10K | 17 | 28 | 10.5K |
10.5K | 17.5 | 29 | 11.5K |
11.5K | 18.5 | 30 | 12K |
12.5K | 19 | 31 | 13K |
13.5K | 20 | 32 | 1 |
1 | 20.5 | 33 | 1.5 |
2 | 21 | 34 | 2 |
2.5 | 21.5 | 35 | 3 |
3.5 | 22 | 36 | 4 |
4 | 22.5 | 37 | 5 |
5 | 23.5 | 38 | 6 |

- Place a sheet of paper on the floor and against a wall
- Make sure you are wearing the same socks that you would normally wear with this type of shoe
- Wearing these socks, stand on the sheet of paper with your foot perpendicular to the wall and your heel against the wall.
- Then use a pen to draw a line just in front of your big toe. Repeat for both feet and take the longer distance to determine your size.
- Using a ruler, measure the distance between the wall and the line you drew to find your size.