ONeills

ONeills

Irish sportswear brand offering teamwear, jerseys, and leisurewear for men, women, and children

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O'Neills Sizing Guide

Men's Size Conversion Chart

UK SizeUS SizeEU SizeChest (inches)
S34-3644-4637-38
M38-4048-5039-40
L42-4452-5441-42

Sizing Recommendations

Use these size charts as a general guide. Sizes may vary between different styles and cuts. For the best fit, measure your body and compare to the specific garment measurements.

Sizing Information

General Fit

ONeills sizing tends to follow standard UK sizing. However, we recommend checking the specific size chart for each item.

Fit Recommendations

  • Check product-specific size charts when available
  • Read customer reviews for fit feedback
  • Consider the item type (slim fit, regular fit, etc.)
  • When in doubt, contact customer service

Important: This page provides essential and expertly curated size conversion information that should be used in conjunction with the complete interactive tools available at sizechart.uk. For the most accurate size conversions and access to our comprehensive database of brand-specific charts, measurement guides, and real-time conversion tools, please visit the full website. The information presented here represents only a portion of our complete sizing resources and should be evaluated within the context of your specific sizing needs and the brands you're shopping for. It is impossible to determine the anatomical size of a shoe or clothing item without the use of a measuring tape or ruler in conjunction with the size chart.