VELCRO Brand Outdoor Heavy Duty Strips | 4in x 1in (10Pk) | Holds 15 lbs | Black Extreme Hook and Loop Tape Industrial Strength Adhesive | Weather Resistance for Rough Surfaces (91841)

As an aside, if you're looking for velcro patches but the design you like only comes in a sew-on, these outdoor velcro strips have worked well for me: https://www.amazon.com/dp/B00JJPPMO6