Freshman fox DE Erick Fowler made it into Austin today and is with the team. Here are the NCAA rules for acclimation thanks to @bluejay7780:
During the first two days of the acclimatization period, helmets shall be the only piece of protective equipment student-athletes may wear. During the third and fourth days of the acclimatization period, helmets and shoulder pads shall be the only pieces of protective equipment student-athletes may wear. During the final day of the five-day period and on any days thereafter, student-athletes may practice in full pads.
During the first two days of the acclimatization period, helmets shall be the only piece of protective equipment student-athletes may wear. During the third and fourth days of the acclimatization period, helmets and shoulder pads shall be the only pieces of protective equipment student-athletes may wear. During the final day of the five-day period and on any days thereafter, student-athletes may practice in full pads.