We consider refined relationships for thickness of a composite shell made by wounding of continuous fiber. We obtain a formula for thickness of the shell in the zone of a pole hole. Using this formula, we have an opportunity to predict a real thickness better. The thickness of the shell in the zone of a pole hole is approximated using a condition of conservation of material and smooth junction with the thickness curve corresponding to the other part of a bottom of the shell. As a result, we may take into consideration the phenomenon when a tape slides off an outstanding part of the shell and describe distribution of thickness of the shell in the zone of the pole hole more accurately.