For information about the Brexit regulations impacting UK customers, please read here
A good base is basic. Find that perfect functional wicking tee that will allow you to move and keep odors away.
A warming mid layer to put on when the evening gets colder or when the altitudes get higher.
Winds can be rough and rain can be unpredictable - especially in the summer. Be sure to have shell you can trust.
A packable insulating layer can save the day - or the entire expedition. Always bring this layer along, because the weather changes!