I've just had a conversation with my wife who has been a physiotherapist for 40 years. Shin splints are tiny flakes of bone lifted on the shin, frequently caused by too much exercise when young (before the bones are properly hardened / formed) - but I guess you know that. Our niece overdid the ballet dancing when a teenager and had a problem
This isn't something that can be cured, but can be managed. If they hurt, then rest is the best short term treatment, putting your feet up, being warm might help (whiskey wasn't mentioned) . They can be aggravated by walking uphill, walking on the flat less so. Good footwear and posture will help, but their isn't a one size fits all 'insole for shin splints'; that's not to say you personally might find an insole (or boot) that works for you, it's going to be a very individual thing. The angle of your lower leg to plane of the foot is what is actually bringing on the discomfort, building in rests, less steep routes, choice of the stepped route rather than the sloped route might also help