Tetrahedra and octahedra can pack to fill all-space. at high enough frequency of packing, a Cuboctahedron will arise. Buckminster Fuller Elaborated about this in his books Synergetics 1&2. 

Width, in 18.50 20.50 22.50 24.50 26.50 
Length, in 27.00 28.00 29.00 30.00 31.00 

Made for supreme softness, these personalized, Econscious EC1000 unisex t-shirts for men and women feature a 100% Certified-Organic, ring-spun cotton fabric. Also equipped with an organic cotton/ 1x1 neck rib, and a shoulder seam that is clean-finished with self-fabric tape, these printable tees deliver in both comfort and style. .: 100% certified organic, ring-spun cotton .: Medium fabric (5.5 oz/yd² (186 g/m²)) .: Regular fit .: Tear-away label