Outdoor Lace size information is a guide only. The actual lace length required may vary depending on width and length of feet and make of shoe. 3-4 pr eyelets: 36 inch lace. 5-6 pr eyelets: 40 inch lace. 6-7 pr eyelets: 45 inch lace: 7-8 pr eyelets: 54 inch lace. 8-9 pr eyelets: 63 inch lace. Over 9 eyelets: 72 inch lace.