What to pack?
When packing you must not forget that Puerto Madryn is a maritime city.
In summer you must have beach clothing, something light and sandals to wear during the day and warm clothes for the fresh nights.
In winter the best recommendation is to wear several layers of clothing, because it is cold at open air but there is very good heating indoors.
Also in winter you have to have very good, waterproof footwear. You must also carry, at any time of the year, a good jacket.
Similarly, it is essential to take sunscreen and sunglasses.