cellhelmet Altitude X Series Case for Samsung Galaxy S21 Ultra (Black). The cellhelmet Altitude X Series case for Samsung S21 Ultra is military grade and has shock tech to protect your Samsung Galaxy S21 Ultra phone from drops and impacts. The slim design and no-slip grip give comfort and reduce instances of dropping your Galaxy S21 Ultra. The Cross Diffuse cross pattern technology gives impact dispersion to reduce the effects of impact when the phone is dropped. The back of the phone receives ultimate protection with Pyramid Protect, which is the raised internal pyramids inside the case to protect the back of the phone from drops and impact.