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STEP 1: MEASURE YOURSELF

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 above your eyebrows).

STEP 2: FIND YOUR SIZE

Use the chart below to determine your size. 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.

SWOOSH FLEX

NIKE SIZE NUMERIC SIZE HEAD SIZE (IN.) HEAD SIZE (CM)
S/M 6 7/8–7 1/4 21 1/2–22 5/8 55-58
M/L 7 1/8–7 1/2 22 1/4-23 1/2 57–60
L/XL 7 3/8–7 3/4 23-24 1/4 59–62
One Size Fits Most -Adults 7 1/8–7 1/2 22 1/4-23 1/2 57–60
One Size Fits Most -Kids 6 5/8-7/18 20 7/8-22 1/4 53-57

ADJUSTABLE

NIKE SIZE NUMERIC SIZE HEAD SIZE (IN.) HEAD SIZE (CM)
One Size Fits All -Adults 6 3/4–7 5/8 21 1/8-23 7/8 54–61
One Size Fits All -Kids 6 5/8-7 1/8 20 7/8-22 1/4 53-57

FITTED

NIKE SIZE NUMERIC SIZE HEAD SIZE (IN.) HEAD SIZE (CM)
One Size 6 7/8-8 21 1/2-25+ 55-64

WOMEN'S

NIKE SIZE NUMERIC SIZE HEAD SIZE (IN.) HEAD SIZE (CM)
One Size Fits All 6 3/4–7 3/8 21 1/8-23 54–59

ALPHA SIZING

NIKE SIZE NUMERIC SIZE HEAD SIZE (IN.) HEAD SIZE (CM)
XS 6 3/4 21 1/8 54
S 7 21 7/8 56
M 7 1/4 22 5/8 58
L 7 1/2 23 1/2 60
XL 7 3/4 24 1/4 62

DUAL SIZING

NIKE SIZE NUMERIC SIZE HEAD SIZE (IN.) HEAD SIZE (CM)
XS/S 6 7/8 21 1/2 55
S/M 7 1/8 22 1/4 57
M/L 7 3/8 23 59
L/XL 7 5/8 23 7/8 61
XL/XXL 7 7/8 24 5/8 63

FREE RETURNS

Learn more about Nike's Return Policies for members and non-members.

Returns Policy and Guide.