Essential info
Essential info

Benefits
Benefits

SONIC RA MAX 2 W
Assisted Transition
For the Max, the Geometric Decoupling™axis is oriented to assure a stable forward transition from heel to toe.
Vibration Dampening
The unique Vibe Technology midsole construction uses EnergyCell™+and Opal to attenuate fatigue-causing vibrations for a cushioned yet responsive ride.
Structured Fit
The road-specific Sensifit upper teams with function specific engineered mesh to conform to the contours of the foot and gently secure it in place.
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.
Soft collar construction
A soft collar improves comfort and creates a more ergonomic feel.
Welded upper
Stitch-free upper construction provides a smooth, glove-like, fit and feel.
Molded OrthoLite®
OrthoLite® insole technology provides superior cushioning, unmatched comfort, breathability and durability, and is one of the most cost-effective ways to upgrade the comfort and performance of your footwear.
Regular laces
Traditional lacing system with eyelets.
Materials & Maintenance
Materials & Maintenance
Textile
Textile
Rubber
Synthetic / Textile
Reviews
Reviews
Men's Footwear
Calculate your own measurements, then select your product size
ORDER SIZE | FOOT LENGTH (INCH) | EUR | US | JP |
3.5 | 8.5 | 36 | 4 M | 22 |
4 | 8.7 | 36 2/3 | 4.5 M | 22.5 |
4.5 | 8.9 | 37 1/3 | 5 M | 23 |
5 | 9.1 | 38 | 5.5 M | 23.5 |
5.5 | 9.3 | 38 2/3 | 6 M | 24 |
6 | 9.4 | 39 1/3 | 6.5 M | 24.5 |
6.5 | 9.6 | 40 | 7 M | 25 |
7 | 9.8 | 40 2/3 | 7.5 M | 25.5 |
7.5 | 10 | 41 1/3 | 8 M | 26 |
8 | 10.2 | 42 | 8.5 M | 26.5 |
8.5 | 10.4 | 42 2/3 | 9 M | 27 |
9 | 10.6 | 43 1/3 | 9.5 M | 27.5 |
9.5 | 10.8 | 44 | 10 M | 28 |
10 | 11 | 44 2/3 | 10.5 M | 28.5 |
10.5 | 11.2 | 45 1/3 | 11 M | 29 |
11 | 11.4 | 46 | 11.5 M | 29.5 |
11.5 | 11.6 | 46 2/3 | 12 M | 30 |
12 | 11.8 | 47 1/3 | 12.5 M | 30.5 |
12.5 | 12 | 48 | 13 M | 31 |
13 | 12.2 | 48 2/3 | 13.5 M | 31.5 |
13.5 | 12.4 | 49 1/3 | 14 M | 32 |
14 | 12.6 | 50 | 14.5 M | 32.5 |
14.5 | 12.8 | 50 2/3 | 15 M | 33 |
ORDER SIZE | FOOT LENGTH (CM) | EUR | US | JP |
3.5 | 21.5 | 36 | 4 M | 22 |
4 | 22 | 36 2/3 | 4.5 M | 22.5 |
4.5 | 22.5 | 37 1/3 | 5 M | 23 |
5 | 23 | 38 | 5.5 M | 23.5 |
5.5 | 23.5 | 38 2/3 | 6 M | 24 |
6 | 24 | 39 1/3 | 6.5 M | 24.5 |
6.5 | 24.5 | 40 | 7 M | 25 |
7 | 25 | 40 2/3 | 7.5 M | 25.5 |
7.5 | 25.5 | 41 1/3 | 8 M | 26 |
8 | 26 | 42 | 8.5 M | 26.5 |
8.5 | 26.5 | 42 2/3 | 9 M | 27 |
9 | 27 | 43 1/3 | 9.5 M | 27.5 |
9.5 | 27.5 | 44 | 10 M | 28 |
10 | 28 | 44 2/3 | 10.5 M | 28.5 |
10.5 | 28.5 | 45 1/3 | 11 M | 29 |
11 | 29 | 46 | 11.5 M | 29.5 |
11.5 | 29.5 | 46 2/3 | 12 M | 30 |
12 | 30 | 47 1/3 | 12.5 M | 30.5 |
12.5 | 30.5 | 48 | 13 M | 31 |
13 | 31 | 48 2/3 | 13.5 M | 31.5 |
13.5 | 31.5 | 49 1/3 | 14 M | 32 |
14 | 32 | 50 | 14.5 M | 32.5 |
14.5 | 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
ORDER SIZE | FOOT LENGTH (INCH) | EUR | US | JP |
3.5 | 8.5 | 36 | 5 | 22 |
4 | 8.7 | 36 2/3 | 5.5 | 22.5 |
4.5 | 8.9 | 37 1/3 | 6 | 23 |
5 | 9.1 | 38 | 6.5 | 23.5 |
5.5 | 9.3 | 38 2/3 | 7 | 24 |
6 | 9.4 | 39 1/3 | 7.5 | 24.5 |
6.5 | 9.6 | 40 | 8 | 25 |
7 | 9.8 | 40 2/3 | 8.5 | 25.5 |
7.5 | 10 | 41 1/3 | 9 | 26 |
8 | 10.2 | 42 | 9.5 | 26.5 |
8.5 | 10.4 | 42 2/3 | 10 | 27 |
9 | 10.6 | 43 1/3 | 10.5 | 27.5 |
9.5 | 10.8 | 44 | 11 | 28 |
10 | 11 | 44 2/3 | 11.5 | 28.5 |
10.5 | 11.2 | 45 1/3 | 12 | 29 |
11 | 11.4 | 46 | 12.5 | 29.5 |
11.5 | 11.6 | 46 2/3 | 13 | 30 |
12 | 11.8 | 47 1/3 | 13.5 | 30.5 |
12.5 | 12 | 48 | 14 | 31 |
13 | 12.2 | 48 2/3 | 14.5 | 31.5 |
13.5 | 12.4 | 49 1/3 | 15 | 32 |
14 | 12.6 | 50 | 15.5 | 32.5 |
14.5 | 12.8 | 50 2/3 | 16 | 33 |
ORDER SIZE | FOOT LENGTH (CM) | EUR | US | JP |
3.5 | 21.5 | 36 | 5 | 22 |
4 | 22 | 36 2/3 | 5.5 | 22.5 |
4.5 | 22.5 | 37 1/3 | 6 | 23 |
5 | 23 | 38 | 6.5 | 23.5 |
5.5 | 23.5 | 38 2/3 | 7 | 24 |
6 | 24 | 39 1/3 | 7.5 | 24.5 |
6.5 | 24.5 | 40 | 8 | 25 |
7 | 25 | 40 2/3 | 8.5 | 25.5 |
7.5 | 25.5 | 41 1/3 | 9 | 26 |
8 | 26 | 42 | 9.5 | 26.5 |
8.5 | 26.5 | 42 2/3 | 10 | 27 |
9 | 27 | 43 1/3 | 10.5 | 27.5 |
9.5 | 27.5 | 44 | 11 | 28 |
10 | 28 | 44 2/3 | 11.5 | 28.5 |
10.5 | 28.5 | 45 1/3 | 12 | 29 |
11 | 29 | 46 | 12.5 | 29.5 |
11.5 | 29.5 | 46 2/3 | 13 | 30 |
12 | 30 | 47 1/3 | 13.5 | 30.5 |
12.5 | 30.5 | 48 | 14 | 31 |
13 | 31 | 48 2/3 | 14.5 | 31.5 |
13.5 | 31.5 | 49 1/3 | 15 | 32 |
14 | 32 | 50 | 15.5 | 32.5 |
14.5 | 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.
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.