Wooden handled mattock?
They sometimes come with a coating of a varnish. This will give you blisters the first time you use it, (at least).
A light sanding to remove the varnish will prevent the blisters, and you can treat the handle to a light wipe with linseed oil.
Unless you envisage a 2nd job as a hard rock miner, treat yourself to a mattock.
You do have toe-protected work boots?