NIKE ALPHAFLY 4 WOMEN'S ROAD RACING SHOES
Our legendary racer delivers more energy with less weight.
Our iconic racing shoe is back and lighter than ever. We've updated the Air Zoom unit for the first time in the Alphafly's history, making it softer and quieter. Advancements to our ZoomX foam deliver more bounce with less weight, opening up your marathon potential.
More energy return with less weight thanks to an updated Air Zoom unit and ZoomX LT foam
Softer and quieter than previous models
Added cushioning under the curved forefoot
Don't let them hear you coming. An updated Air Zoom unit is quieter and delivers a softer feel underfoot with more energy return.
A wide carbon fiber Flyplate unlocks a propulsive sensation while maintaining the stability you need to power through all 26.2 miles.
Two types of foam work together to deliver a lighter, springier ride with smoother transitions. ZoomX foam provides our highest energy return and sits under ZoomX LT foam, the lightest version of our most responsive cushioning.
Keep your cool. An updated Atomknit upper features zones of open-hole mesh for enhanced breathability and midfoot cables for improved containment.
More Details
- Weight: Approx. 188g/6.6oz (Men's US 8.5/Women's US 10)
- Heel-to-toe drop: 8mm (Men's US 8.5/Women's US 10)
YOUR SHOPPING JOURNEY STARTS HERE.
Discover your favorite styles online and find them at a store near you.
STORE LOCATIONS
FIND YOUR SIZE
NIKE
FOOTWEAR
| US - MEN'S | US - WOMEN'S | US - KIDS | UK | CM | EU |
| 3.5 | 5 | 3.5Y | 3 | 22.5 | 35.5 |
| 4 | 5.5 | 4Y | 3.5 | 23 | 36 |
| 4.5 | 6 | 4.5Y | 4 | 23.5 | 36.5 |
| 5 | 6.5 | 5Y | 4.5 | 23.5 | 37.5 |
| 5.5 | 7 | 5.5Y | 5 | 24 | 38 |
| 6 | 7.5 | 6Y | 5.5 | 24 | 38.5 |
| 7 | 8.5 | 7Y | 6 | 25 | 40 |
| 7.5 | 9 | 7.5Y | 6.5 | 25.5 | 40.5 |
| 8 | 9.5 | 8Y | 7 | 26 | 41 |
| 8.5 | 10 | 8.5Y | 7.5 | 26.5 | 42 |
| 9 | 10.5 | 9Y | 8 | 27 | 42.5 |
| 9.5 | 11 | 9.5Y | 8.5 | 27.5 | 43 |
| 10 | 11.5 | 10Y | 9 | 28 | 44 |
| 10.5 | 12 | 10.5Y | 9.5 | 28.5 | 44.5 |
| 11 | 12.5 | 10 | 29 | 45 | |
| 11.5 | 13 | 10.5 | 29.5 | 45.5 | |
| 12 | 13.5 | 11 | 46 | ||
| 12.5 | 14 | 11.5 | 30.5 | 47 | |
| 13 | 14 | 11.5 | 30.5 | 47 | |
| 13.5 | 15 | 12.5 | 31.5 | 48 | |
| 14 | 15.5 | 13 | 32 | 48.5 | |
| 14.5 | 16 | 13.5 | 32.5 | 49 | |
| 15 | 16.5 | 14 | 33 | 49.5 | |
| 15.5 | 17 | 14.5 | 33.5 | 50 | |
| 16 | 17.5 | 15 | 34 | 50.5 | |
| 16.5 | 18 | 15.5 | 34.5 | 51 | |
| 17 | 18.5 | 16 | 35 | 51.5 | |
| 17.5 | 19 | 16.5 | 35.5 | 52 | |
| 18 | 19.5 | 17 | 36 | 52.5 | |
| 18.5 | 20 | 17.5 | 36.5 | 53 | |
| 19 | 20.5 | 18 | 37 | 53.5 | |
| 19.5 | 21 | 18.5 | 37.5 | 54 | |
| 20 | 21.5 | 19 | 38 | 54.5 | |
| 20.5 | 22 | 19.5 | 38.5 | 55 | |
| 21 | 22.5 | 20 | 39 | 55.5 | |
| 21.5 | 23 | 20.5 | 39.5 | 56 | |
| 22 | 23.5 | 21 | 40 | 56.5 | |
| 11 | 12.5 | 10 | 29 | 45 |
MEN'S APPAREL
The measurements on the size chart are body measurements.
FIT TIPS
If you're on the borderline between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit.
HOW TO MEASURE
BUST: Measure around the fullest part of your bust, keeping the measuring tape horizontal.
WAIST: Measure around the narrowest part (typically where your body bends side to side), keeping the tape horizontal.
HIPS: Measure around the fullest part of your hips, keeping the tape horizontal.
MEN'S TOPS
| SIZE | CHEST(IN) | WAIST(IN) | HIP(IN) | HEIGHT(IN) |
| XS | 35.2-35 | 26.29 | 32.5-35 | 5'7"-6'0" |
| XS | 35-37.5 | 29-32 | 35-37.5 | 5'7"-6'0" |
| M | 37.5,41 | 32-35 | 37.5-41 | 5'7"-6'0" |
| L | 41-44 | 35-38 | 41-44 | 5'7"-6'0" |
| XL | 44-48.5 | 38-43 | 44-47 | 5'7" |
| 2XL | 48.5-53.5 | 43-47.5 | 47-50.5 | 5'7"-6'0" |
| 3XL | 53.5-58 | 47.5-52.5 | 50.5-53.5 | 5'7"-6'0" |
| 4XL | 58-63 | 52.5-57 | 53.5-58.5 | 5'7"-6'0" |
MEN'S BOTTOMS
| SIZE | WAIST(IN) | HIP(IN) | LEG LENGTH(IN) | HEIGHT(IN) |
| XS | <29 | <35 | <32.25 | 5'7"-6'0" |
| S | 29-32 | 35-37.5 | 32.25 | 5'7"-6'0" |
| M | 32-35 | 37.5-41 | 32.5 | 5'7"-6'0" |
| L | 35-38 | 41-44 | 32.75 | 5'7"-6'0" |
| XL | 38-43 | 44-47 | 33 | 5'7" |
| 2XL | 43-47.5 | 47-50.5 | 33.25 | 5'7"-6'0" |
| 3XL | 47.5-52.5 | 50.5-53.5 | 33.5 | 5'7"-6'0" |
| 4XL | 52.5 | 53.5-58.5 | 33.75 | 5'7"-6'0" |
WOMEN'S APPAREL
The measurements on the size chart are body measurements.
FIT TIPS
If you're on the borderline between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit.
HOW TO MEASURE
BUST: Measure around the fullest part of your bust, keeping the measuring tape horizontal.
WAIST: Measure around the narrowest part (typically where your body bends side to side), keeping the tape horizontal.
HIPS: Measure around the fullest part of your hips, keeping the tape horizontal.
WOMEN'S TOPS
| SIZE | BUST(IN) | WAIST(IN) | HIP(IN) |
| XXS | 27.5-29.5 | 21.5-23.5 | 30.5-33 |
| XS | 29.5-32.5 | 23.5-26 | 33-35.5 |
| S | 32.5-35.5 | 26-29 | 35.5-38.5 |
| M | 35.5-38 | 29-31.5 | 38.5-41 |
| L | 38-41 | 31.5-34.5 | 41-44 |
| XL | 41-44.5 | 34.5-38.5 | 44-47 |
| 2XL | 44.5-48.5 | 38.5-42.5 | 47-50 |
| 1X | 45-49 | 41-45 | 46-50 |
| 2X | 49-53 | 45-49 | 50-54 |
| 3X | 53-57 | 49-53 | 54-58 |
WOMEN'S BOTTOMS
| SIZE | WAIST(IN) | HIP(IN) | HEIGHT |
| XXS | 21.5-23.5 | 30.5-33 | 5'4"-5'8" |
| XS | 23.5-26 | 33-35.5 | 5'4"-5'8" |
| S | 26-29 | 35.5-38.5 | 5'4"-5'8" |
| M | 29-31.5 | 38.5-41 | 5'4"-5'8" |
| L | 31.5-34-5 | 41-44 | 5'4"-5'8" |
| XL | 34.5-38.5 | 44-47 | 5'4"-5'8" |
| 2XL | 38.5-42.5 | 47-50 | 5'4"-5'8" |
| 1XL | 41-45 | 46-50 | 5'4"-5'8" |
| 2X | 45-49 | 50-54 | 5'4"-5'8" |
| 3X | 49-53 | 54-58 | 5'4"-5'8" |
SPORTS BRAS
| BAND/CUP SIZE | ALPHA SIZE |
ALPHA/CUP SIZE
|
| 30A-30C | XS | XS(AC) |
| 30D-30E | XS | |
| 32A-32B | XS | XS(A-C) |
| 32C | S | S(A-C) |
| 32D-32E | S | S(D-E) |
| 34A-34C | S | S(A-C) |
| 34D-34E | M | M(D-E) |
| 36A-36C | M | M(D-E) |
| 36D-36E | L | L(D-E) |
| 38A-38C | L | L(A-C) |
| 38D-38E | XL | XL(D-E) |
| 40A-40C | XL | XL(A-C) |
| 40D-40E | 2XL | XL(D-E) |
| 42A-42C | 1X | |
| 42D-42E | 2X | |
| 44A-44C | 2X | |
| 44D-44E | 3X |
KIDS APPAREL
The measurements on the size chart are body measurements.
FIT TIPS
If you're on the borderline between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit.
HOW TO MEASURE
BUST: Measure around the fullest part of your bust, keeping the measuring tape horizontal.
WAIST: Measure around the narrowest part (typically where your body bends side to side), keeping the tape horizontal.
HIPS: Measure around the fullest part of your hips, keeping the tape horizontal.
| SIZE | NUMERIC SIZE | AGE | HEIGHT(IN) | CHEST(IN) | WAIST(IN) |
| XS | 6-7 | 7-8 | 48-50 | 25.5-26 | 23.5-24 |
| S | 8-9 | 8-10 | 50-54 | 26-27 | 24-25.5 |
| S+ | 8-9 Plus | 8-10 | 50-54 | 28-30 | 26-28 |
| M | 10-12 | 10-12 | 54-58 | 27-29.5 | 25.5-27 |
| M+ | 10-12 Plus | 10-12 | 54-58 | 30-33 | 28-30 |
| L | 14-16 | 12-13 | 58-62 | 29.5-32 | 27-28.5 |
| L+ | 14-46 Plus | 12-13 | 58-62 | 33-36 | 30-32 |
| XL | 18-20 | 13-15 | 62-67 | 32-35 | 28-5-29.5 |
| XL+ | 18-20 Plus | 13-15 | 62-67 | 36-38.5 | 32-34.5 |
| SIZE | NUMERIC SIZE | AGE | HEIGHT(IN) | CHEST(IN) | WAIST(IN) |
| XS | 6-7 | 7-8 | 48-50 | 25.5-27 | 23.5-24 |
| S | 8-9 | 8-10 | 50-54 | 27-29 | 24-25 |
| S+ | 8-9 Plus | 8-10 | 50-54 | 29-32 | 26.5-29.5 |
| M | 10-12 | 10-12 | 54-57 | 29-31 | 25-27 |
| M+ | 10-12 Plus | 10-12 | 54-57.5 | 32-34.5 | 29.5-32 |
| L | 14-16 | 12-13 | 57-61 | 31-33.5 | 27-28 |
| L+ | 14-46 Plus | 12-13 | 57.5-61.5 | 34.5-38 | 32-35 |
| XL | 18-20 | 13-15 | 61-65 | 33.5-36.5 | 28-29.5 |
| XL+ | 18-20 Plus | 13-15 | 61.5-65.5 | 38-41.5 | 35-39 |
LITTLE KIDS' CLOTHING
| SIZE | NUMERIC SIZE | AGE | HEIGHT(IN) | CHEST(IN) | WAIST(IN) |
| XS | 4 | 3-4 | 38.5-41 | 22-23 | 21.5-22 |
| S | 5 | 4-5 | 41-43 | 23-24 | 22-22.5 |
| M | 6 | 5-6 | 43-46 | 24-24.75 | 22.5-23 |
| L | 6X/7 | 6-7 | 46-48 | 24.5-26 | 23-24 |
| XL | 7X | 7-8 | 48-50.5 | 26-27 | 24-25 |
EQUIPMENT
The measurements on the size chart are body measurements.
FIT TIPS
* If you're on the borderline between two sizes, order the smaller size for a tighter fit or the larger size for a looser fit.
* OS = One Size.
HOW TO MEASURE
Measure the circumference of your head using a measuring tape. Wrap it around your head at the point where the hat will sit (about an inch/2.5cm above your eyebrows).
| SIZE | US - MEN'S | US - WOMEN'S | US KIDS | UK | EU |
| XS | 13C-3Y | 31-35 | |||
| S | 4-6 | 3Y-5Y | 2-5 | 34-38 | |
| M | 6-8 | 6-10 | 5Y-7Y | 5-8 | 38-42 |
| L | 8-12 | 10-13 | 8-11 | 42-46 | |
| XL | 12-15 | 11-14.5 | 46-50 |
HATS AND HEADWEAR
| Nike Hat Size | Head Size | Alpha Size | Swosh Flex | Unisex | Women's | Dual Size Unisex | Women's |
| 6 1/2 | 20 1/2 | XS | S | ||||
| 6 5/8 | 20 7/8 | XS/S | XS | S OS | S/M | ||
| 6 3/4 | 21 1/8 | XS | XS/S | XS S OS | S OS | S/M | |
| 6 7/8 | 21 1/2 | XS/S S/M | XS S OS | S OS | XS/S | ||
| 7 | 21 7/8 | S | XS/S S/M | XS S OS | S OS | M/L | |
| 7 1/8 | 22 1/4 | S/M M/L OS | XS S OS | S OS | S/M | ||
| 7 1/4 | 22 5/8 | M | S/M M/L OS | S OS | OS L | L/XL | |
| 7 3/8 | 23 | M/L L/XL OS | S OS XL | OS L | M/L | ||
| 7 1/2 | 23 1/2 | L | M/L L/XL OS | OS XL | L | ||
| 7 5/8 | 23 7/8 | L/XL XL/XXL | OS XL | L | |||
| 7 3/4 | 24 1/4 | XL | L/XL XL/XXL | XL | L | ||
| 7 7/8 | 24 5/8 | XL | L | XL/XXL | |||
| 8 | 25+ | XL |