The invention relates to a retractable thermal barrier consisting of an assembly of inflatable flexible tubes 1 juxtaposed side-by-side and connected via at least one of their ends to a device 4 for blowing in gas capable of inflating them, the tubes 1, once inflated, being capable of being coupled together along a wide longitudinal-contact surface, whilst the thermal barrier may be retracted by deflation of the tubes 1 which form it. The invention applies to the protection against freezing of ground surfaces (sports fields, etc.) or of plantations (vineyards, etc.) and in the production of insulating false ceilings (for greenhouses, swimming pools, etc.). <IMAGE>
