I am using the 20mm size with my Garmin sports watch. The band fits the watch perfectly. The band is thick enough to hold my (relatively heavy) watch securely. The band is stretchy enough fit fit comfortably on my wrist even when I'm exercising. I'm not sure how much the ventilation holes help, but I suppose they can't hurt.
18Mm Black Regular-Length Watch Band For Casio And Other Sport Watches - Voguestrap TX1852 Allstrap
37 Review
Customizable And Comfortable: WOCCI Nylon Sport Watch Bands With Quick Release And Adjustable Fastener For Men And Women - Choose From 18Mm, 20Mm, Or 22Mm Widths
26 Review
Handmade Leather Watch Strap For Men - Soft Vintage Torbollo Horween Replacement Band With Quick Release
17 Review
WOCCI Watch Bands - Premium Silicone Rubber Replacement Straps With Stainless Steel Buckle (16Mm 18Mm 20Mm 22Mm 24Mm)
25 Review
Silver Steampunk Skeleton Mechanical Watch - TREEWETO
10 Review
Men'S Digital Sports Watch: Large Face, Waterproof Wrist Watches With Stopwatch Alarm & LED Back Light
16 Review
🕰️ LYMFHCH Classic Smooth Vintage Numerals: A Timeless Nostalgic Choice
10 Review
Mechanical Hand-Winding Skeleton Watches For Men: A Classic, Fashionable Steampunk Dress Watch In Stainless Steel
28 Review