Adult ticks typically latch on about knee level, while nymphs commonly latch on at shoe level. But ALL ticks tend to crawl upward; so while nymphs crawl upward under pant cuffs, adult ticks will crawl up the outside of pants, then readily continue to crawl upward under an untucked shirt. It only takes these hungry adult ticks a few minutes to crawl up your leg and under your shirt. Once under there, they bite wherever clothing stops their upward movement — bra straps, underarms, mid back — and it’s really hard to check your back for ticks. Tucking your shirt can help keep ticks from biting!