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The short answer
For warm rounds: pima cotton blends for the polo, lightweight technical poplin or jersey for the bottom half, and avoid heavy structured fabrics for layers. For the most comfortable round of the year, mock collars in lightweight knits beat structured collars on heat.
Pima cotton
Long-staple cotton. Soft, breathable, holds dye well so colours stay vivid. Slightly less wicking than synthetic. The default choice for an everyday polo.
Recycled performance poly
Engineered to wick sweat away from skin and dry fast. Tends to hold structure (collar stays sharp). Best when you sweat hard or play very hot rounds. Look for “rPET” labels for the sustainability story.
Merino blend
Surprisingly summer-friendly in fine weight: temperature-regulating, odour-resistant, packs small. Best layered (under a wind shell on cool mornings). Heavier merino is winter-only.
Linen blends
Light, breathable, slightly textured look. Pure linen wrinkles fast (avoid on photos / dress-code rounds). Linen-cotton blends hold shape better and still breathe.
What to avoid in summer
Heavy ponte knits, anything with a thick lining, structured wovens with non-stretch waistbands, and 100% non-wicking cotton on the body if you sweat a lot.
Curated summer picks
Our Summer on the Course collection groups the pieces we keep returning to in warm weather. Most cost between €60 and €230.