From oven to freezer, and vice versa, safely. To prepare for a busy weeks meals or freeze leftovers, Pyrex has designed Cook & Freeze, a range of heat resistant borosilicate glass ovenware that allows you to move from freezer to oven and oven to freezer safely. Cook & Freeze is designed to withstand a thermal shock of up to 220°C. Without handles and with straight lines, its design allows for optimal storage in the freezer.