sides, an outsole that is more suited to urban environments, a side-zip with a Velcro fastener, and a composite toe. Aircrew are instead issued the 800ST flight boots by Belleville that are waterproof, have a full leather upper, are steel-toed, and have a similar design to the U.S. Army temperate weather combat boots, albeit with different materials. The Republic of Singapore Navy servicemen are issued the modified version of the RSAF's safety boots. The modifications include the two water outlets (similar to the Singapore Army's standard issue boots), and a reduction in height from a high-cut boot to a mid-cut. Spain Before 1979, the Spanish army had issued triple-buckled boots, with full lace-up boots becoming common from 1984 to 1986. During the 1980s Spain changed boot suppliers and had many variations of design including Vibram or Panamá sole, buckles or laces, and eyelets or speed lace. There were three common models: Regular – The general-issue boot used for instruction and campaign, it had a medium sole thickness and a few cleats. Smooth-soled versions fell into disuse over time, leaving only the instruction and campaign model. Walking – A lighter-constructed version of the regular boot with no cleats. It had a distinctive peculiarity as a boot to wear comfortably in the street, on flat ground, and was commonly known as vulgarmente (crude or vulgar) for its thin soles. Paratrooper – A boot exclusive to paratrooper units. It lacked the issue triple buckles (due to the hazard of hooking the parachute lines), and was slightly higher with extra shin-to-foot support and reinforced toe and heel. This was the general approach in the late 1970s and early 1980s. During this period the manufacturer, Segarra, had various major problems which prevented regular deliveries on their supply contract with the Ministry of Defence. This eventually led to Segarra's closure, with Imipiel chosen as an alternative provider. Imipiel-manufactured boots were copies of the Segarra models but proved to be inferior, with poorly-attached soles that opened and peeled-off with relative ease, greatly shortening their useful lifetime. In an attempt to overcome the debonding problem, Imipiel changed the outsole, removing the cleats, and incorporated "panamá" type soles. The Ministry initiated parallel studies for the final adoption of a new model boot, accepting new concepts on the original boot of instruction and campaign and benefits of the paratrooper-styled boot. United Kingdom During the First World War, the British army