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fitnesshats

Hats, measured.

FitnessHats is an independent lab for workout and running hats. We measure every hat the same way, in millimeters and grams, and quote size charts exactly as each brand publishes them. Start with your size.

Unit

58.0 cm is 22.83 in. Drag the tape or use the arrow keys to adjust.

US hat size

7 1/4

head diameter in inches, nearest 1/8

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in
Your size on each brand's published chart
Brand and lineYour sizeSource
New Era59FIFTY fitted7 3/8Between 7 1/4 and 7 3/8; the brand says to size up.New Era chartchecked 2026-10-04
RichardsonFitted7 1/4Richardson chartchecked 2026-10-04
MelinSize guide (all caps)SMALLMelin chartchecked 2026-10-04
Ciele AthleticsGOCap, FSTCap and TRLCapS/M or M/L or L/XLThe published ranges for these sizes overlap at your measurement.Ciele Athletics chartchecked 2026-10-04
FlexfitStandard stretch-fitS/M or OSFA or L/XLThe published ranges for these sizes overlap at your measurement.Flexfit chartchecked 2026-10-04
NikeAdjustable capsM/L or ONE SIZE or L/XLThe published ranges for these sizes overlap at your measurement.Nike chartchecked 2026-10-04
Under ArmourMen's and unisex headwearOSFM or M/L or L/XLThe published ranges for these sizes overlap at your measurement.Under Armour chartchecked 2026-10-04
Your size on all brand charts, with each chart's published numbers

Opens on an example 58.0 cm head. Shown: one chart from each of 7 brands, of the 21 brands whose charts we have checked.

What we measure on every capA cap drawn in side profile with dimension lines for crown height along the front seam, back seam, brim length, and the inside circumference at the sweatband, plus weight.Crown heightfront seam, mmBack seammmBrim length, mmInside circumferencefully tight to fully open, mmWeight, gdry, tags off

What we measure on every hat

On a cap we take 10 measurements, each twice, with a tailor's tape, a steel ruler and a 0.1 g scale. Then 7 photos from fixed angles, the fit on a measured head, and a dated log of every workout or run the hat was worn for. A hat needs 3 logged sessions before we say anything about how it wears.

  • Weightg
  • Inside circumference, smallestmm
  • Inside circumference, largestmm
  • Crown height (front seam)mm
  • Back seammm
  • Side arcmm
  • Brim lengthmm
  • Brim widthmm
  • Brim curvemm
  • Sweatband widthmm

No scores, no stars, no “tested” badges. The full protocol is published with the first profiles.

Sizing

The hat database

Hat profiles appear here as hats are measured, and only then. Each one carries the measurements above, the photos, the fit on a measured head and its wear log. A best-of list goes up only when at least 8 measured hats qualify for it.