Before unrolling, BEFORE UNROLLING ts room Your mat has been rolled for economical and timely delivery. Depending on temperature conditions, your mat may take up to 24 hours to return to a flattened state. Forcing a cold mat to unroll may cause cracking. Please follow the guidelines below to unroll your mat. UNROLLING YOUR CHAIR MAT + Allow your mat to reach room temperature before unrolling your mat (approx. 24 hours). » Carefully unroll your mat and place it on the floor, smooth side up.