The Crosstrek site is pretty intuitive and has all the required equipments for a high altitude trek. Every time I have trekked with Indiahikes, I have opted for rentals which not only saves cost but I do not need to go through hassles of purchasing the gear, carrying that to the base camp and then later on ensuring proper care of the gear is being taken, even if its not being used.
I would strongly recommend people to explore trekking gears on the rental site, which is well maintained and easy to use.