Sinharaja rainforest anti-leech gear: canvas sock weave tightness and chemical repellent efficacy?

Navigating the wet-zone trails of Sinharaja Rainforest requires specialized anti-leech footwear protection because standard knit socks allow land leeches (Haemadipsa zeylanica) to push through yarn gaps. Anti-leech socks are manufactured from tightly woven, unbleached calico or heavy canvas cotton with a high thread count per square inch. The fabric is pulled over trouser cuffs and tied securely with cloth tapes below the knee. Impregnating the canvas with natural tobacco extract, eucalyptus oil, or DEET repellent paralyzes leech sucker disks upon contact.