With a soft fleece inside, there's no better way to show your enthusiasm for optimal packing than putting on the super comfortable Optimal Packing Premium Pullover. The design features the best known packing of 17 unit squares into a larger containing square. This method of packing fits inside a containing square of side length ~4.675 and was found by John Bidwell in 1997. Accordingly, the left sleeve has the number of squares that have been packed: "17", and the right sleeve has the side length of the containing square: "4.675".
• 100% cotton face • 65% cotton, 35% polyester • Charcoal Heather is 55% cotton, 45% polyester • Fabric weight: 8.5 oz/y² (288.2 g/m²) • Tightly knit 3-end fleece • Side-seamed construction • Self-fabric patch on the back • Double-needle stitched rib collar, cuffs, and hem
