This great-value twinpack gives you a 1 litre bottle of Schwarzkopf's Natural Styling Hydrowave Classic perm and a litre of Neutraliser. The Natural Styling Classic perm lotion combines the strengthening and restructuring effect of hydrolysed keratin with the moisturising power of Schwarzkopf's Hydrowave technology, to create long-lasting (up to 12 weeks) curls and waves.