
I've never had a nylon thermal top, but I can tell you these things get cold even in the height of summer. If they're just for sport then that's fine, but they're advertised as "thermal" which makes no sense.

H2H Mens Casual Slim Fit Short Sleeve T-Shirts Cotton Blended Soft Lightweight V-Neck/Crew-Neck
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Calvin Klein π Herringbone Sleeve Men's Dress Clothing
50 Review

Gildan Performance Men's π Clothing and Shirts with Moisture-Wicking Polyester
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Men'S Long Sleeve Polo Shirt - Slim Fit, Stretchy, Breathable Collar
43 Review