And as to length, adjust them so that with your upper arm by your side, fore arm horizontal, elbow at right angles you have a comfortable grip which as commented means thumb and finger tips more than a totally clasped hand. Thick side of palm pushes down on the strap. Shorter than you would use them for xc skiing. You will probably make minimal adjustments as you get used to them. Oh, going uphill I tend to plant mine behind my feet and shove hard against the strap. Have .actually used poles for their proper purpose, xc skiing, where active length needs to be longer and a full arm swing needed. Great fun if you fancy a different winter holiday, not least for the excuse to glug lots of gluwein.