Size guide

Every figure below is the garment measured flat, in inches, taken from our factory specification. Polos, midlayers and gilets run S to 3XL. Shorts are sized by waist, 30 to 40. If you are between two sizes, size up for a more relaxed fit through the shoulders.

Polo shirts

Regular fit. Straight hem, so front and back length are the same. Fabric is 100% polyester or 92% polyester with 8% elastane depending on the style — the composition for each polo is listed on its own product page.

Polo shirts — measured flat, inches
Measurement S M L XL XXL 3XL
To fit chest 38–40 40–42 43–45 45–47 48–50 50–52
Chest, flat 19¾ 21 22¼ 23½ 24¾ 26
Body length 28 28¾ 29½ 30¼ 31 31¾
Shoulder 18¼ 18⅞ 19½ 20⅛ 20¾ 21⅜
Sleeve length 17 17¾ 18½ 19¼ 20 20¾
Sleeve opening 5¾ 6 6¼ 6½ 6¾ 7
Hem width 19¼ 20½ 21¾ 23 24¼ 25½
Neck width 7 7¼ 7½ 7¾ 8 8¼

Midlayers

Quarter-zip, mock neck. Cut close through the body and designed to layer over a polo without bulk. Sleeve length is measured from the centre back of the neck to the cuff, so the figures read longer than a shoulder-to-cuff measurement.

Midlayers — measured flat, inches
Measurement S M L XL XXL 3XL
To fit chest 37–39 40–42 43–45 46–48 49–51 52–54
Chest, flat 19½ 21 22½ 24 25½ 27
Body length 26½ 27⅝ 28¾ 29⅞ 31 32⅛
Sleeve, from back centre 33 34 35 36 37 38
Arm width 7½ 7¾ 8 8¼ 8½ 8¾
Sleeve opening 3½ 3¾ 3¾ 4 4⅛ 4¼
Hem width 18 19½ 21 22½ 24 25½
Zip length 7¾ 7¾ 7¾ 8 8 8

Gilets

Full-zip, sleeveless, quilted back. Cut roughly ¾ inch wider through the chest than the polo at every size so it layers over one cleanly. The shoulder measures narrower than a polo of the same size — that is the sleeveless armhole construction, not a smaller fit.

Gilets — measured flat, inches
Measurement S M L XL XXL 3XL
To fit chest 39–41 42–44 45–47 48–50 51–53 54–56
Chest, flat 20½ 22 23½ 25 26½ 28
Body length 26½ 27½ 28½ 29½ 30½ 31½
Shoulder 16½ 17½ 18½ 19½ 20½ 21½
Armhole 9⅞ 10¼ 10⅝ 11 11⅜ 11¾
Hem width 19 20½ 22 23½ 25 26½
Neck width 8 8¼ 8½ 8¾ 9 9¼
Zip length 26 26¾ 27½ 28¼ 29 29¾

Shorts

Sized by waist, 30 to 40. The inseam is 8½ inches on every size — the leg length does not change as the waist goes up. Waist and seat below are the full round measurement, not measured flat.

Each size is cut with room to move, so a 32 measures 33½ inches round the waist. Order the waist size you normally wear.

Shorts — round measurements, inches
Measurement 30 32 34 36 38 40
Waist 31½ 33½ 35½ 37½ 39½ 41½
Seat 39 41 43 45 47 49
Thigh 25 26 27 28 29 30
Leg opening 20 21 22 23 24 25
Inseam 8½ 8½ 8½ 8½ 8½ 8½
Outseam 17¼ 17¾ 18¼ 18¾ 19¼ 19¾
Front rise 11 11½ 12 12½ 13 13½
Back rise 15 15½ 16 16½ 17 17½

Caps

One size, adjustable at the back. No snapback closure.

How to measure

Lay the garment flat and smooth it out. Measure straight across the chest, one inch below the armhole — that is the flat chest figure in every table. Double it for the measurement all the way round. Body length runs from the top of the shoulder straight down to the hem. For shorts, fasten the waistband, measure across and double it.

The easiest check is against something you already own and like the fit of. Measure that, match it to the table, and order the size that lines up.

Fabric composition

Composition varies by style and is listed on each product page. Across the current range: polos are 100% polyester or 92% polyester with 8% elastane; some performance styles use a 61% nylon, 29% polyester, 10% spandex blend. Midlayers and gilets are polyester-based performance knits.

If the fit is wrong

Every order comes with free 30-day returns. If a size is not right, send it back unworn and we will exchange or refund it. Any questions about fit before you order, email sales@apeiron-clothing.com and we will measure the actual garment for you.

Measurements marked with an asterisk are taken from the graded pattern rather than a measured production sample and may vary by up to half an inch.