Speedo Mens Global Alpha Size Guide

This size guide covers the Speedo Mens Global Alpha Size Matrix, a unified international sizing system covering 11 sizes based on waist measurement. International equivalents are provided for GB, D, F, I, Lat Am, AUS, USA, CAN and MEX size systems. Sizing is based on body measurements — use your waist and hip measurements alongside your usual GB waist size to find the most accurate fit.

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Body Measurement Points

Speedo mens body measurement guide showing chest, waist and hip measurement points

How to Measure

Use a soft tape measure and take all measurements directly against the skin. Body measurements are the most reliable way to find your correct size.

A
Waist Measure 5cm down from the natural waist at the narrowest point. This is how Speedo defines waist for this size matrix and is the primary sizing measurement.
B
Hips Measure 10cm down from the natural waist around the widest point of the hips and seat.

If measurements fall between sizes, size up. Use waist as the primary guide for jammers and swim shorts.

Sizing Table : Speedo Mens Global Alpha

Size	65cm / 26	70cm / 28	75cm / 30	80cm / 32	85cm / 34	90cm / 36	95cm / 38	100cm / 40	105cm / 42	110cm / 44	115cm / 46
International Size Equivalents
GB	65cm / 26	70cm / 28	75cm / 30	80cm / 32	85cm / 34	90cm / 36	95cm / 38	100cm / 40	105cm / 42	110cm / 44	115cm / 46
D	1	2	3	4	5	6	7	8	9	10	11
F	34	36	38	40	42	44	46	48	50	52	54
I	40	42	44	46	48	50	52	54	56	58	60
Lat Am	Talla 26	Talla 28	Talla 30	Talla 32	Talla 34	Talla 36	Talla 38	Talla 40	Talla 42	Talla 44	Talla 46
AUS	6	8	10	12	14	16	18	20	22	24	26
USA	26	28	30	32	34	36	38	40	42	44	46
CAN	26	28	30	32	34	36	38	40	42	44	46
MEX	26	28	30	32	34	36	38	40	42	44	46

GB size is shown as waist measurement in cm and inches. USA, CAN and MEX sizes are identical across all sizes in this range.

Size	65cm / 26	70cm / 28	75cm / 30	80cm / 32	85cm / 34	90cm / 36	95cm / 38	100cm / 40	105cm / 42	110cm / 44	115cm / 46
Body Measurements (cm)
Waist* (cm)	63–68	69–74	75–79	80–84	85–88	89–93	94–98	99–103	104–108	109–113	114–118
Hips** (cm)	80–85	86–92	93–97	98–102	103–106	107–111	112–116	117–121	122–126	127–131	132–136

Size	65cm / 26	70cm / 28	75cm / 30	80cm / 32	85cm / 34	90cm / 36	95cm / 38	100cm / 40	105cm / 42	110cm / 44	115cm / 46
Body Measurements (inches)
Waist* (inches)	24.5–26.5	27–29	29.5–31	31.5–33	33.5–34.5	35–36.5	37–38.5	39–40.5	41–42.5	43–44.5	45–46.5
Hips** (inches)	31.5–33.5	34–36	36.5–38	38.5–40	40.5–41.5	42–43.5	44–45.5	46–47.5	48–49.5	50–51.5	52–53.5

*Waist is measured 5cm down from the natural waist at the narrowest point. **Hips are measured 10cm down from the natural waist around the widest point. All measurements are body measurements, not garment measurements. Scroll horizontally to see all sizes.

Fit Notes : Speedo Mens Global Alpha

GB sizes are expressed as waist measurement in cm and inches (e.g. 80cm / 32). Use your waist measurement to identify your column, then confirm using the body measurements below.
Waist in this size matrix is measured 5cm down from the natural waist at the narrowest point, not at the natural waistline. Measure accordingly for the most accurate result.
Hips are measured 10cm down from the natural waist around the widest point of the hips and seat.
If your measurements fall between two sizes, size up for a more comfortable fit.
USA, CAN and MEX sizes are identical across this entire range.
Unsure? Contact our team or call +44 1827 330600.

Frequently Asked Questions : Speedo Mens Global Alpha

Measure your chest, waist (5cm down from natural waist) and hips (10cm down from natural waist) and match to the body measurements table. You can also use your usual GB waist size in cm or inches to locate the right column, then confirm using the body measurement rows.

Speedo's Global Alpha size matrix defines waist as measured 5cm below the natural waistline, which corresponds more closely to where the waistband of a jammer or swim short actually sits. Measuring at the natural waist will give a different figure, so follow the 5cm guideline for the most accurate size selection.

In the Speedo Mens Global Alpha matrix, GB size is expressed as actual waist measurement in centimetres and inches (e.g. 80cm / 32), while USA, CAN and MEX sizes use the same numeric sizing (26, 28, 30 etc.) which happens to match the waist measurement in inches. All three are identical across every size in this range.

Use your waist and hip measurements as the primary guide. The GB size columns are expressed as waist measurements in cm and inches, so find the column that matches your waist size and confirm using the body measurement rows. If your waist and hip suggest different sizes, waist takes priority for jammers and swim shorts.

The smallest size is 65cm / 26 (chest 80 to 85 cm, waist 63 to 68 cm) and the largest is 115cm / 46 (chest 132 to 136 cm, waist 114 to 118 cm). Not all sizes are available in every style — check the individual product listing to confirm which sizes are stocked.

These are European regional size systems. D refers to German sizing, F to French sizing, and I to Italian sizing. Each uses a different numeric scale to represent the same body measurements. Use the international equivalents table above to cross-reference your usual size in any of these systems.