The best strap for the Galaxy Watch 4 classic turned out to be the new Fabric Band. The one in the package is crap, and the others: Sport and Extreme Sport are
My Favorite Strap for the Samsung Galaxy Watch4/Watch4 Classic
Sport Strap for Samsung Galaxy Watch 6/5/4 44mm 40mm/Watch 5 Pro 45mm,No Gaps Leather Strap Single Tour Bracelet 20mm Band for Galaxy Watch 4 Classic ...
Samsung Galaxy Watch 4 Classic: Hands-On & First Impressions