The costs to procure the products we sell are historically volatile and subject to fluctuations arising from changes in supply and demand, national and international economic conditions, raw material costs, labor costs, competition, market speculation, government regulation and trade policies, supply chain constraints, as well as delivery delays or cost changes due to the availability of domestic or global logistics, and fuel cost volatility.
Our financial performance is impacted by price fluctuations in the cost to procure substantially all the products we sell and our ability to reflect these changes, in a timely manner, in our customer pricing. The prices of products we purchase and sell increased in the fiscal year ended January 30, 2022 ("fiscal 2021") and the fiscal year ended January 29, 2023 ("fiscal 2022") due to several factors, including, but not limited to, constraints in the supply chain associated with labor, global logistics, general inflationary pressures and availability of raw materials, that are in part due to conflict in countries that export raw materials in our products and other weather events. These factors led to decreased availability of certain products that we purchase from our suppliers. Disruptions caused by natural disasters or similar extreme weather events may also affect our ability to both maintain key products in inventory and deliver products to our customers on a timely basis, which may in turn adversely affect the Company. For example, operations at certain plants and facilities located in Texas that produce resin, a raw material used in the production of the PVC pipe that we purchase from suppliers, were temporarily shut down as a result of the winter storms of 2021, which caused supply chain disruptions and PVC pipe shortages, which in turn drove product cost increases. Any material shortage of products in the market as a result of natural disasters or similar extreme weather events can negatively impact our net sales, and we may not be able to offset increased product costs via corresponding price increases. Additionally, the conflict in Ukraine resulted in increases in costs associated with products containing ductile iron and steel. A shortage of available manufacturing capacity, or excess capacity, in the industry can result in significant increases or declines in the supply of our products, which in turn results in fluctuations in the market prices for our products, sometimes within a short period of time. Although in some cases we have firm price quotes with our suppliers that fix the price at which we purchase products for a defined period of time, we have experienced termination of certain contracts through the enactment of force majeure contractual clauses.
We may experience price volatility associated with the implementation or rescission of tariffs or other restrictions placed on foreign imports by the U.S. or any related counter-measures are taken by impacted foreign countries. Tariff-related activities may also impact the level of demand associated with products subject to tariffs as our customers may seek alternative products. Most recently, the U.S. enacted tariffs on imported steel products from China that led domestic sellers to respond with market-based increases. It remains unclear what future actions may be taken by the U.S. or other governments with respect to international trade agreements, the imposition or removal of tariffs on goods imported into the U.S., the creation or removal of barriers to trade, tax policy related to international commerce, or other trade matters, and the impact of those actions of the cost of products we sell.
We have a limited ability to control the timing and amount of changes in the cost to procure our products. Although we seek to recover increases in our product costs by passing product cost increases on to our customers, we may not always be successful. In addition, in periods of declining costs for our products, we may face pricing pressure from our customers, requiring us to reduce the prices at which we sell our products to our customers in order to remain competitive in our markets. As we experienced significant product cost increases in fiscal 2021 and fiscal 2022, there is increased risk in future periods that we may experience a decreased rate of inflation, net sales declines or net sales growth at substantially lower rates than in those periods. Due to supply chain constraints, distributors may have increased inventory levels to ensure product availability. As the supply chain improves and product lead time becomes more predictable, distributors may reduce their inventory levels. This may increase competition by suppliers based on price and contribute to deflation. From fiscal 2021 to fiscal 2023, our gross margin improved by approximately 150 basis points in part due to several initiatives, including private label product expansion, sourcing optimization, data-driven pricing strategies and an expansion of value-added products and services. We estimate that a portion of the gross margin increases we experienced in fiscal 2023, fiscal 2022 and fiscal 2021 could be temporary in nature and may not be sustainable once product supply dynamics return to normal, market pricing stabilizes and benefits from low cost inventory purchases diminish. Our ability to adjust prices in a timely manner to account for such price fluctuations may often depend on market conditions, our fixed costs and other factors, and our failure to adapt our product prices and operational strategies could result in lower revenue, profitability and the write down of our inventories. Historically, we have not engaged in material hedging strategies for purchases of products. We generally sell our products on a spot basis and not under long-term contracts. Any increase in product costs that are not offset by an increase in our prices, or our inability to maintain price levels in an environment of declining product costs, could have a material adverse effect on our business or financial condition.