Abstract: A heat pack for warming the heel of an infant with a front panel and a rear panel wherein the rear panel is adapted for placement on the infant's heel and has an outer layer formed of a nonwoven material which may be wetted. A band is provided for attaching the heat pack to the infant's heel. Heat from the heat pack effectively drives water applied to the nonwoven material into the infant's heel where it is then trapped in the skin under the heat pack. By thus moisturizing and softening the skin, a puncture necessary for taking a blood sample is eased.

Abstract: A heat pack for warming the heel of an infant with a front panel and a rear panel wherein the rear panel is adapted for placement on the infant's heel and has an outer layer formed of a nonwoven material which may be wetted. A band is provided for attaching the heat pack to the infant's heel. Heat from the heat pack effectively drives water applied to the nonwoven material into the infant's heel where it is then trapped in the skin under the heat pack. By thus moisturizing and softening the skin, a puncture necessary for taking a blood sample is eased.

Abstract: A heat pack for warming the heel of an infant with a front panel and a rear panel wherein the rear panel is adapted for placement on the infant's heel and has an outer layer formed of a nonwoven material. A band is provided for attaching the heat pack to the infant's heel.

Abstract: A heat pack for use as a warmer mattress for infants is formed of a flexible container at least partly filled with a supercooled aqueous salt solution which is selectively trigger-activated to produce heat by exothermic crystallization. The container is compartmentalized, being divided into several compartments by a heat-sealing arrangement of upper and lower joined halves. When crystallization is initiated by activating the trigger, crystallization is propagated quickly into the several compartments, from each of which heat is thereby liberated, the compartments being shaped such that the crystallizing solution in each compartment is effectively trapped therein to substantially prevent saddle-bagging, and whereby the heat pack reliably and safely supports an infant upon the warmer mattress. The upper and lower halves are heat-sealed together in various possible heat seal patterns defining the compartments, as by sealed margins and heat-seal extensions extending inwardly from the peripherally margins.

Abstract: A trigger to initiate crystallization of a supercooled aqueous salt solution of a heat pack, thereby liberating heat. The trigger, when activated, pierces the container, allowing the salt solution to contact salt crystals, and initiate crystallization of the solution. A seal over the trigger prevents the solution from leaking from the heat pack. Optionally, the heat pack contains a flexible foam rubber pad immersed in the salt solution in the container to prevent saddlebagging.

Abstract: A trigger to initiate crystallization of a supercooled aqueous salt solution of a heat pack, thereby liberating heat. The trigger, when activated, pierces the container, allowing air to enter the pack and initiate crystallization of the solution. A seal over the trigger prevents the solution from leaking from the heat pack.

Abstract: An invertible, foldable sign formed of an integral blank synthetic resin material permits repeated folding and reversibility for display of multiple messages. The sign has opposite side panels joined by an integral resilient hinge, which panels are latchable into display configuration by integral tabs. The sign is self-latching for shipping or storage.