This invention pertains to a bore covering for creating controlled environments and specifically for maintaining temperature within the bore of an MRI scanner. The bore covering includes a covering sheet with fastening means (e.g., weak-tack adhesive, pressure-sensitive adhesive or low-tack adhesive) around its inner surfaces that permits reversible attachment to the scanner. The adhesive ends can be peeled away to expose an edge of the bore opening or the entire sheet may be constructed with peel away gaps so that warm air can be pumped into the bore. On the inner surface the bore covering may include a gap that is connected to a climate control device or an exhaust vent to expel air out of the MRI scanner bore.