The pattern is written using Drops Nepal (50g, 75m, 65% wool, 35% Alpaca). It is an Aran weight yarn and I used a 7.00mm Tunisian crochet hook. You may need to alter the size of the hook to achieve the correct tension/gauge. Written in only one size at the moment of up to 42 inch chest.
A knowledge of Tunisian crochet is needed, simple stitch purled, knit stitch, slip stitch, chain.