" Extra Strength" 100% Soft Cotton T-Shirt by Rick Rietveld. A fun design from Rick featuring the iconic tandem surfing but with a twist. Do you have that Exxxtra strength to wear this design? A super-soft t-shirt in 100% cotton, with Rietveld branding on the front and this classic print on the rear. The t-shirt has a great hand feel, making it super soft.